From 76697301e77ee1b35aa20ca7357dcf3ba849a4b3 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Mon, 14 Sep 2015 16:17:36 -0700
Subject: [PATCH] Fix IE's failure to scroll grid (issue 173)

IE does not realize that when a pattern changes, objects painted with
said pattern need to be rerendered.
---
 blockly_compressed.js   | 22 +++++++++++-----------
 blockly_uncompressed.js |  2 +-
 core/blockly.js         |  5 +++++
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/blockly_compressed.js b/blockly_compressed.js
index 628f6e03b..2e23d7b68 100644
--- a/blockly_compressed.js
+++ b/blockly_compressed.js
@@ -885,7 +885,7 @@ this.foreignObject_.appendChild(a);Blockly.bindEvent_(this.textarea_,"mouseup",t
 Blockly.Comment.prototype.resizeBubble_=function(){var a=this.bubble_.getBubbleSize(),b=2*Blockly.Bubble.BORDER_WIDTH;this.foreignObject_.setAttribute("width",a.width-b);this.foreignObject_.setAttribute("height",a.height-b);this.textarea_.style.width=a.width-b-4+"px";this.textarea_.style.height=a.height-b-4+"px"};
 Blockly.Comment.prototype.setVisible=function(a){if(a!=this.isVisible())if(!this.block_.isEditable()&&!this.textarea_||goog.userAgent.IE)Blockly.Warning.prototype.setVisible.call(this,a);else{var b=this.getText(),c=this.getBubbleSize();a?(this.bubble_=new Blockly.Bubble(this.block_.workspace,this.createEditor_(),this.block_.svgPath_,this.iconX_,this.iconY_,this.width_,this.height_),this.bubble_.registerResizeEvent(this,this.resizeBubble_),this.updateColour(),this.text_=null):(this.bubble_.dispose(),
 this.foreignObject_=this.textarea_=this.bubble_=null);this.setText(b);this.setBubbleSize(c.width,c.height)}};Blockly.Comment.prototype.textareaFocus_=function(a){this.bubble_.promote_();this.textarea_.focus()};Blockly.Comment.prototype.getBubbleSize=function(){return this.isVisible()?this.bubble_.getBubbleSize():{width:this.width_,height:this.height_}};Blockly.Comment.prototype.setBubbleSize=function(a,b){this.textarea_?this.bubble_.setBubbleSize(a,b):(this.width_=a,this.height_=b)};
-Blockly.Comment.prototype.getText=function(){return this.textarea_?this.textarea_.value:this.text_};Blockly.Comment.prototype.setText=function(a){this.textarea_?this.textarea_.value=a:this.text_=a};Blockly.Comment.prototype.dispose=function(){this.block_.comment=null;Blockly.Icon.prototype.dispose.call(this)};Blockly.Connection=function(a,b){this.sourceBlock_=a;this.targetConnection=null;this.type=b;this.y_=this.x_=0;this.dbList_=a.workspace.connectionDBList;this.hidden_=!this.dbList_;this.inDB_=!1};
+Blockly.Comment.prototype.getText=function(){return this.textarea_?this.textarea_.value:this.text_};Blockly.Comment.prototype.setText=function(a){this.textarea_?this.textarea_.value=a:this.text_=a};Blockly.Comment.prototype.dispose=function(){this.block_.comment=null;Blockly.Icon.prototype.dispose.call(this)};Blockly.Connection=function(a,b){this.sourceBlock_=a;this.type=b;this.dbList_=a.workspace.connectionDBList;this.hidden_=!this.dbList_};Blockly.Connection.prototype.targetConnection=null;Blockly.Connection.prototype.check_=null;Blockly.Connection.prototype.x_=0;Blockly.Connection.prototype.y_=0;Blockly.Connection.prototype.inDB_=!1;
 Blockly.Connection.prototype.dispose=function(){if(this.targetConnection)throw"Disconnect connection before disposing of it.";this.inDB_&&this.dbList_[this.type].removeConnection_(this);Blockly.highlightedConnection_==this&&(Blockly.highlightedConnection_=null);Blockly.localConnection_==this&&(Blockly.localConnection_=null)};Blockly.Connection.prototype.isSuperior=function(){return this.type==Blockly.INPUT_VALUE||this.type==Blockly.NEXT_STATEMENT};
 Blockly.Connection.prototype.connect=function(a){if(this.sourceBlock_==a.sourceBlock_)throw"Attempted to connect a block to itself.";if(this.sourceBlock_.workspace!==a.sourceBlock_.workspace)throw"Blocks are on different workspaces.";if(Blockly.OPPOSITE_TYPE[this.type]!=a.type)throw"Attempt to connect incompatible types.";if(this.type==Blockly.INPUT_VALUE||this.type==Blockly.OUTPUT_VALUE){if(this.targetConnection)throw"Source connection already connected (value).";if(a.targetConnection){var b=a.targetBlock();
 b.setParent(null);if(!b.outputConnection)throw"Orphan block does not have an output connection.";for(var c=this.sourceBlock_;c=Blockly.Connection.singleConnection_(c,b);)if(c.targetBlock())c=c.targetBlock();else{c.connect(b.outputConnection);b=null;break}b&&setTimeout(function(){b.outputConnection.bumpAwayFrom_(a)},Blockly.BUMP_DELAY)}}else{if(this.targetConnection)throw"Source connection already connected (block).";if(a.targetConnection){if(this.type!=Blockly.PREVIOUS_STATEMENT)throw"Can only do a mid-stack connection with the top of a block.";
@@ -925,13 +925,13 @@ a?"rtl":"ltr";Blockly.Tooltip.DIV.style.display="block";Blockly.Tooltip.visible=
 (c=b.width-Blockly.Tooltip.DIV.offsetWidth-2*Blockly.Tooltip.MARGINS);Blockly.Tooltip.DIV.style.top=d+"px";Blockly.Tooltip.DIV.style.left=c+"px"}};
 Blockly.Tooltip.wrap_=function(a,b){if(a.length<=b)return a;for(var c=a.trim().split(/\s+/),d=0;d<c.length;d++)c[d].length>b&&(b=c[d].length);var e,d=-Infinity,f,g=1;do{e=d;f=a;for(var h=[],k=c.length/g,l=1,d=0;d<c.length-1;d++)l<(d+1.5)/k?(l++,h[d]=!0):h[d]=!1;h=Blockly.Tooltip.wrapMutate_(c,h,b);d=Blockly.Tooltip.wrapScore_(c,h,b);a=Blockly.Tooltip.wrapToText_(c,h);g++}while(d>e);return f};
 Blockly.Tooltip.wrapScore_=function(a,b,c){for(var d=[0],e=[],f=0;f<a.length;f++)d[d.length-1]+=a[f].length,!0===b[f]?(d.push(0),e.push(a[f].charAt(a[f].length-1))):!1===b[f]&&d[d.length-1]++;a=Math.max.apply(Math,d);for(f=b=0;f<d.length;f++)b-=2*Math.pow(Math.abs(c-d[f]),1.5),b-=Math.pow(a-d[f],1.5),-1!=".?!".indexOf(e[f])?b+=c/3:-1!=",;)]}".indexOf(e[f])&&(b+=c/4);1<d.length&&d[d.length-1]<=d[d.length-2]&&(b+=.5);return b};
-Blockly.Tooltip.wrapMutate_=function(a,b,c){for(var d=Blockly.Tooltip.wrapScore_(a,b,c),e,f=0;f<b.length-1;f++)if(b[f]!=b[f+1]){var g=[].concat(b);g[f]=!g[f];g[f+1]=!g[f+1];var h=Blockly.Tooltip.wrapScore_(a,g,c);h>d&&(d=h,e=g)}return e?Blockly.Tooltip.wrapMutate_(a,e,c):b};Blockly.Tooltip.wrapToText_=function(a,b){for(var c=[],d=0;d<a.length;d++)c.push(a[d]),void 0!==b[d]&&c.push(b[d]?"\n":" ");return c.join("")};Blockly.FieldLabel=function(a,b){this.sourceBlock_=null;this.size_=new goog.math.Size(0,17.5);this.class_=b;this.setText(a)};goog.inherits(Blockly.FieldLabel,Blockly.Field);Blockly.FieldLabel.prototype.EDITABLE=!1;
+Blockly.Tooltip.wrapMutate_=function(a,b,c){for(var d=Blockly.Tooltip.wrapScore_(a,b,c),e,f=0;f<b.length-1;f++)if(b[f]!=b[f+1]){var g=[].concat(b);g[f]=!g[f];g[f+1]=!g[f+1];var h=Blockly.Tooltip.wrapScore_(a,g,c);h>d&&(d=h,e=g)}return e?Blockly.Tooltip.wrapMutate_(a,e,c):b};Blockly.Tooltip.wrapToText_=function(a,b){for(var c=[],d=0;d<a.length;d++)c.push(a[d]),void 0!==b[d]&&c.push(b[d]?"\n":" ");return c.join("")};Blockly.FieldLabel=function(a,b){this.size_=new goog.math.Size(0,17.5);this.class_=b;this.setText(a)};goog.inherits(Blockly.FieldLabel,Blockly.Field);Blockly.FieldLabel.prototype.EDITABLE=!1;
 Blockly.FieldLabel.prototype.init=function(a){this.sourceBlock_||(this.sourceBlock_=a,this.textElement_=Blockly.createSvgElement("text",{"class":"blocklyText",y:this.size_.height-5},null),this.class_&&Blockly.addClass_(this.textElement_,this.class_),this.visible_||(this.textElement_.style.display="none"),a.getSvgRoot().appendChild(this.textElement_),this.textElement_.tooltip=this.sourceBlock_,Blockly.Tooltip.bindMouseEvents(this.textElement_),this.updateTextNode_())};
-Blockly.FieldLabel.prototype.dispose=function(){goog.dom.removeNode(this.textElement_);this.textElement_=null};Blockly.FieldLabel.prototype.getSvgRoot=function(){return this.textElement_};Blockly.FieldLabel.prototype.setTooltip=function(a){this.textElement_.tooltip=a};Blockly.Input=function(a,b,c,d){this.type=a;this.name=b;this.sourceBlock_=c;this.connection=d;this.fieldRow=[];this.align=Blockly.ALIGN_LEFT;this.visible_=!0};
+Blockly.FieldLabel.prototype.dispose=function(){goog.dom.removeNode(this.textElement_);this.textElement_=null};Blockly.FieldLabel.prototype.getSvgRoot=function(){return this.textElement_};Blockly.FieldLabel.prototype.setTooltip=function(a){this.textElement_.tooltip=a};Blockly.Input=function(a,b,c,d){this.type=a;this.name=b;this.sourceBlock_=c;this.connection=d;this.fieldRow=[]};Blockly.Input.prototype.align=Blockly.ALIGN_LEFT;Blockly.Input.prototype.visible_=!0;
 Blockly.Input.prototype.appendField=function(a,b){if(!a&&!b)return this;goog.isString(a)&&(a=new Blockly.FieldLabel(a));this.sourceBlock_.rendered&&a.init(this.sourceBlock_);a.name=b;a.prefixField&&this.appendField(a.prefixField);this.fieldRow.push(a);a.suffixField&&this.appendField(a.suffixField);this.sourceBlock_.rendered&&(this.sourceBlock_.render(),this.sourceBlock_.bumpNeighbours_());return this};
 Blockly.Input.prototype.appendTitle=function(a,b){console.warn("Deprecated call to appendTitle, use appendField instead.");return this.appendField(a,b)};Blockly.Input.prototype.removeField=function(a){for(var b=0,c;c=this.fieldRow[b];b++)if(c.name===a){c.dispose();this.fieldRow.splice(b,1);this.sourceBlock_.rendered&&(this.sourceBlock_.render(),this.sourceBlock_.bumpNeighbours_());return}goog.asserts.fail('Field "%s" not found.',a)};Blockly.Input.prototype.isVisible=function(){return this.visible_};
 Blockly.Input.prototype.setVisible=function(a){var b=[];if(this.visible_==a)return b;for(var c=(this.visible_=a)?"block":"none",d=0,e;e=this.fieldRow[d];d++)e.setVisible(a);this.connection&&(a?b=this.connection.unhideAll():this.connection.hideAll(),d=this.connection.targetBlock())&&(d.getSvgRoot().style.display=c,a||(d.rendered=!1));return b};Blockly.Input.prototype.setCheck=function(a){if(!this.connection)throw"This input does not have a connection.";this.connection.setCheck(a);return this};
-Blockly.Input.prototype.setAlign=function(a){this.align=a;this.sourceBlock_.rendered&&this.sourceBlock_.render();return this};Blockly.Input.prototype.init=function(){if(this.sourceBlock_.workspace.rendered)for(var a=0;a<this.fieldRow.length;a++)this.fieldRow[a].init(this.sourceBlock_)};Blockly.Input.prototype.dispose=function(){for(var a=0,b;b=this.fieldRow[a];a++)b.dispose();this.connection&&this.connection.dispose();this.sourceBlock_=null};Blockly.ScrollbarPair=function(a){this.workspace_=a;this.oldHostMetrics_=null;this.hScroll=new Blockly.Scrollbar(a,!0,!0);this.vScroll=new Blockly.Scrollbar(a,!1,!0);this.corner_=Blockly.createSvgElement("rect",{height:Blockly.Scrollbar.scrollbarThickness,width:Blockly.Scrollbar.scrollbarThickness,"class":"blocklyScrollbarBackground"},null);Blockly.Scrollbar.insertAfter_(this.corner_,a.getBubbleCanvas())};
+Blockly.Input.prototype.setAlign=function(a){this.align=a;this.sourceBlock_.rendered&&this.sourceBlock_.render();return this};Blockly.Input.prototype.init=function(){if(this.sourceBlock_.workspace.rendered)for(var a=0;a<this.fieldRow.length;a++)this.fieldRow[a].init(this.sourceBlock_)};Blockly.Input.prototype.dispose=function(){for(var a=0,b;b=this.fieldRow[a];a++)b.dispose();this.connection&&this.connection.dispose();this.sourceBlock_=null};Blockly.ScrollbarPair=function(a){this.workspace_=a;this.hScroll=new Blockly.Scrollbar(a,!0,!0);this.vScroll=new Blockly.Scrollbar(a,!1,!0);this.corner_=Blockly.createSvgElement("rect",{height:Blockly.Scrollbar.scrollbarThickness,width:Blockly.Scrollbar.scrollbarThickness,"class":"blocklyScrollbarBackground"},null);Blockly.Scrollbar.insertAfter_(this.corner_,a.getBubbleCanvas())};Blockly.ScrollbarPair.prototype.oldHostMetrics_=null;
 Blockly.ScrollbarPair.prototype.dispose=function(){goog.dom.removeNode(this.corner_);this.oldHostMetrics_=this.workspace_=this.corner_=null;this.hScroll.dispose();this.hScroll=null;this.vScroll.dispose();this.vScroll=null};
 Blockly.ScrollbarPair.prototype.resize=function(){var a=this.workspace_.getMetrics();if(a){var b=!1,c=!1;this.oldHostMetrics_&&this.oldHostMetrics_.viewWidth==a.viewWidth&&this.oldHostMetrics_.viewHeight==a.viewHeight&&this.oldHostMetrics_.absoluteTop==a.absoluteTop&&this.oldHostMetrics_.absoluteLeft==a.absoluteLeft?(this.oldHostMetrics_&&this.oldHostMetrics_.contentWidth==a.contentWidth&&this.oldHostMetrics_.viewLeft==a.viewLeft&&this.oldHostMetrics_.contentLeft==a.contentLeft||(b=!0),this.oldHostMetrics_&&
 this.oldHostMetrics_.contentHeight==a.contentHeight&&this.oldHostMetrics_.viewTop==a.viewTop&&this.oldHostMetrics_.contentTop==a.contentTop||(c=!0)):c=b=!0;b&&this.hScroll.resize(a);c&&this.vScroll.resize(a);this.oldHostMetrics_&&this.oldHostMetrics_.viewWidth==a.viewWidth&&this.oldHostMetrics_.absoluteLeft==a.absoluteLeft||this.corner_.setAttribute("x",this.vScroll.xCoordinate);this.oldHostMetrics_&&this.oldHostMetrics_.viewHeight==a.viewHeight&&this.oldHostMetrics_.absoluteTop==a.absoluteTop||this.corner_.setAttribute("y",
@@ -951,7 +951,7 @@ Blockly.Scrollbar.prototype.onMouseMoveKnob_=function(a){this.svgKnob_.setAttrib
 Blockly.Scrollbar.prototype.onMouseUpKnob_=function(){Blockly.removeAllRanges();Blockly.hideChaff(!0);Blockly.Scrollbar.onMouseUpWrapper_&&(Blockly.unbindEvent_(Blockly.Scrollbar.onMouseUpWrapper_),Blockly.Scrollbar.onMouseUpWrapper_=null);Blockly.Scrollbar.onMouseMoveWrapper_&&(Blockly.unbindEvent_(Blockly.Scrollbar.onMouseMoveWrapper_),Blockly.Scrollbar.onMouseMoveWrapper_=null)};
 Blockly.Scrollbar.prototype.constrainKnob_=function(a){if(0>=a||isNaN(a))a=0;else{var b=this.horizontal_?"width":"height",c=parseFloat(this.svgBackground_.getAttribute(b)),b=parseFloat(this.svgKnob_.getAttribute(b));a=Math.min(a,c-b)}return a};
 Blockly.Scrollbar.prototype.onScroll_=function(){var a=parseFloat(this.svgKnob_.getAttribute(this.horizontal_?"x":"y")),b=parseFloat(this.svgBackground_.getAttribute(this.horizontal_?"width":"height")),a=a/b;isNaN(a)&&(a=0);b={};this.horizontal_?b.x=a:b.y=a;this.workspace_.setMetrics(b)};Blockly.Scrollbar.prototype.set=function(a){this.svgKnob_.setAttribute(this.horizontal_?"x":"y",a*this.ratio_);this.onScroll_()};
-Blockly.Scrollbar.insertAfter_=function(a,b){var c=b.nextSibling,d=b.parentNode;if(!d)throw"Reference node has no parent.";c?d.insertBefore(a,c):d.appendChild(a)};Blockly.Trashcan=function(a){this.workspace_=a};Blockly.Trashcan.prototype.WIDTH_=47;Blockly.Trashcan.prototype.BODY_HEIGHT_=45;Blockly.Trashcan.prototype.LID_HEIGHT_=15;Blockly.Trashcan.prototype.MARGIN_BOTTOM_=20;Blockly.Trashcan.prototype.MARGIN_SIDE_=20;Blockly.Trashcan.prototype.MARGIN_HOTSPOT_=25;Blockly.Trashcan.prototype.isOpen=!1;Blockly.Trashcan.prototype.svgGroup_=null;Blockly.Trashcan.prototype.svgLid_=null;Blockly.Trashcan.prototype.lidTask_=0;Blockly.Trashcan.prototype.lidOpen_=0;
+Blockly.Scrollbar.insertAfter_=function(a,b){var c=b.nextSibling,d=b.parentNode;if(!d)throw"Reference node has no parent.";c?d.insertBefore(a,c):d.appendChild(a)};Blockly.Trashcan=function(a){this.workspace_=a};Blockly.Trashcan.prototype.WIDTH_=47;Blockly.Trashcan.prototype.BODY_HEIGHT_=44;Blockly.Trashcan.prototype.LID_HEIGHT_=16;Blockly.Trashcan.prototype.MARGIN_BOTTOM_=20;Blockly.Trashcan.prototype.MARGIN_SIDE_=20;Blockly.Trashcan.prototype.MARGIN_HOTSPOT_=25;Blockly.Trashcan.prototype.isOpen=!1;Blockly.Trashcan.prototype.svgGroup_=null;Blockly.Trashcan.prototype.svgLid_=null;Blockly.Trashcan.prototype.lidTask_=0;Blockly.Trashcan.prototype.lidOpen_=0;
 Blockly.Trashcan.prototype.left_=0;Blockly.Trashcan.prototype.top_=0;
 Blockly.Trashcan.prototype.createDom=function(){this.svgGroup_=Blockly.createSvgElement("g",{"class":"blocklyTrash"},null);var a=String(Math.random()).substring(2),b=Blockly.createSvgElement("clipPath",{id:"blocklyTrashBodyClipPath"+a},this.svgGroup_);Blockly.createSvgElement("rect",{width:this.WIDTH_,height:this.BODY_HEIGHT_,y:this.LID_HEIGHT_},b);Blockly.createSvgElement("image",{width:Blockly.SPRITE.width,height:Blockly.SPRITE.height,y:-32,"clip-path":"url(#blocklyTrashBodyClipPath"+a+")"},this.svgGroup_).setAttributeNS("http://www.w3.org/1999/xlink",
 "xlink:href",this.workspace_.options.pathToMedia+Blockly.SPRITE.url);b=Blockly.createSvgElement("clipPath",{id:"blocklyTrashLidClipPath"+a},this.svgGroup_);Blockly.createSvgElement("rect",{width:this.WIDTH_,height:this.LID_HEIGHT_},b);this.svgLid_=Blockly.createSvgElement("image",{width:Blockly.SPRITE.width,height:Blockly.SPRITE.height,y:-32,"clip-path":"url(#blocklyTrashLidClipPath"+a+")"},this.svgGroup_);this.svgLid_.setAttributeNS("http://www.w3.org/1999/xlink","xlink:href",this.workspace_.options.pathToMedia+
@@ -1153,7 +1153,7 @@ Blockly.FieldAngle.prototype.setText=function(a){Blockly.FieldAngle.superClass_.
 Blockly.FieldAngle.prototype.updateGraph_=function(){if(this.gauge_){var a=goog.math.toRadians(Number(this.getText()));if(isNaN(a))this.gauge_.setAttribute("d","M "+Blockly.FieldAngle.HALF+","+Blockly.FieldAngle.HALF),this.line_.setAttribute("x2",Blockly.FieldAngle.HALF),this.line_.setAttribute("y2",Blockly.FieldAngle.HALF);else{var b=Blockly.FieldAngle.HALF+Math.cos(a)*Blockly.FieldAngle.RADIUS,c=Blockly.FieldAngle.HALF+Math.sin(a)*-Blockly.FieldAngle.RADIUS;this.gauge_.setAttribute("d","M "+Blockly.FieldAngle.HALF+
 ","+Blockly.FieldAngle.HALF+" h "+Blockly.FieldAngle.RADIUS+" A "+Blockly.FieldAngle.RADIUS+","+Blockly.FieldAngle.RADIUS+" 0 "+(a>Math.PI?1:0)+" 0 "+b+","+c+" z");this.line_.setAttribute("x2",b);this.line_.setAttribute("y2",c)}}};Blockly.FieldAngle.angleValidator=function(a){a=Blockly.FieldTextInput.numberValidator(a);null!==a&&(a%=360,0>a&&(a+=360),a=String(a));return a};Blockly.FieldCheckbox=function(a,b){Blockly.FieldCheckbox.superClass_.constructor.call(this,"");this.setChangeHandler(b);this.setValue(a)};goog.inherits(Blockly.FieldCheckbox,Blockly.Field);Blockly.FieldCheckbox.prototype.CURSOR="default";
 Blockly.FieldCheckbox.prototype.init=function(a){this.sourceBlock_||(Blockly.FieldCheckbox.superClass_.init.call(this,a),this.checkElement_=Blockly.createSvgElement("text",{"class":"blocklyText",x:-3,y:14},this.fieldGroup_),a=document.createTextNode("\u2713"),this.checkElement_.appendChild(a),this.checkElement_.style.display=this.state_?"block":"none")};Blockly.FieldCheckbox.prototype.getValue=function(){return String(this.state_).toUpperCase()};
-Blockly.FieldCheckbox.prototype.setValue=function(a){a="TRUE"==a;this.state_!==a&&(this.state_=a,this.checkElement_&&(this.checkElement_.style.display=a?"block":"none"),this.sourceBlock_&&this.sourceBlock_.rendered&&this.sourceBlock_.workspace.fireChangeEvent())};Blockly.FieldCheckbox.prototype.showEditor_=function(){var a=!this.state_;if(this.sourceBlock_&&this.changeHandler_){var b=this.changeHandler_(a);void 0!==b&&(a=b)}null!==a&&this.setValue(String(a).toUpperCase())};Blockly.FieldColour=function(a,b){Blockly.FieldColour.superClass_.constructor.call(this,"\u00a0\u00a0\u00a0");this.setChangeHandler(b);this.setValue(a);this.colours_=null;this.columns_=0};goog.inherits(Blockly.FieldColour,Blockly.Field);Blockly.FieldColour.prototype.init=function(a){Blockly.FieldColour.superClass_.init.call(this,a);this.borderRect_.style.fillOpacity=1;this.setValue(this.getValue())};Blockly.FieldColour.prototype.CURSOR="default";
+Blockly.FieldCheckbox.prototype.setValue=function(a){a="TRUE"==a;this.state_!==a&&(this.state_=a,this.checkElement_&&(this.checkElement_.style.display=a?"block":"none"),this.sourceBlock_&&this.sourceBlock_.rendered&&this.sourceBlock_.workspace.fireChangeEvent())};Blockly.FieldCheckbox.prototype.showEditor_=function(){var a=!this.state_;if(this.sourceBlock_&&this.changeHandler_){var b=this.changeHandler_(a);void 0!==b&&(a=b)}null!==a&&this.setValue(String(a).toUpperCase())};Blockly.FieldColour=function(a,b){Blockly.FieldColour.superClass_.constructor.call(this,"\u00a0\u00a0\u00a0");this.setChangeHandler(b);this.setValue(a)};goog.inherits(Blockly.FieldColour,Blockly.Field);Blockly.FieldColour.prototype.colours_=null;Blockly.FieldColour.prototype.columns_=0;Blockly.FieldColour.prototype.init=function(a){Blockly.FieldColour.superClass_.init.call(this,a);this.borderRect_.style.fillOpacity=1;this.setValue(this.getValue())};Blockly.FieldColour.prototype.CURSOR="default";
 Blockly.FieldColour.prototype.dispose=function(){Blockly.WidgetDiv.hideIfOwner(this);Blockly.FieldColour.superClass_.dispose.call(this)};Blockly.FieldColour.prototype.getValue=function(){return this.colour_};Blockly.FieldColour.prototype.setValue=function(a){this.colour_=a;this.borderRect_&&(this.borderRect_.style.fill=a);this.sourceBlock_&&this.sourceBlock_.rendered&&(Blockly.Realtime.blockChanged(this.sourceBlock_),this.sourceBlock_.workspace.fireChangeEvent())};
 Blockly.FieldColour.prototype.getText=function(){var a=this.colour_,b=a.match(/^#(.)\1(.)\2(.)\3$/);b&&(a="#"+b[1]+b[2]+b[3]);return a};Blockly.FieldColour.COLOURS=goog.ui.ColorPicker.SIMPLE_GRID_COLORS;Blockly.FieldColour.COLUMNS=7;Blockly.FieldColour.prototype.setColours=function(a){this.colours_=a;return this};Blockly.FieldColour.prototype.setColumns=function(a){this.columns_=a;return this};
 Blockly.FieldColour.prototype.showEditor_=function(){Blockly.WidgetDiv.show(this,this.sourceBlock_.RTL,Blockly.FieldColour.widgetDispose_);var a=new goog.ui.ColorPicker;a.setSize(this.columns_||Blockly.FieldColour.COLUMNS);a.setColors(this.colours_||Blockly.FieldColour.COLOURS);var b=goog.dom.getViewportSize(),c=goog.style.getViewportPageOffset(document),d=this.getAbsoluteXY_(),e=this.getScaledBBox_();a.render(Blockly.WidgetDiv.DIV);a.setSelectedColor(this.getValue());var f=goog.style.getSize(a.getElement());
@@ -1178,13 +1178,13 @@ Blockly.FieldVariable.prototype.setChangeHandler=function(a){Blockly.FieldVariab
 Blockly.FieldVariable.prototype.init=function(a){this.sourceBlock_||(this.getValue()||this.setValue(Blockly.Variables.generateUniqueName(a.isInFlyout?a.workspace.targetWorkspace:a.workspace)),Blockly.FieldVariable.superClass_.init.call(this,a))};Blockly.FieldVariable.prototype.getValue=function(){return this.getText()};Blockly.FieldVariable.prototype.setValue=function(a){this.value_=a;this.setText(a)};
 Blockly.FieldVariable.dropdownCreate=function(){var a=this.sourceBlock_&&this.sourceBlock_.workspace?Blockly.Variables.allVariables(this.sourceBlock_.workspace):[],b=this.getText();b&&-1==a.indexOf(b)&&a.push(b);a.sort(goog.string.caseInsensitiveCompare);a.push(Blockly.Msg.RENAME_VARIABLE);a.push(Blockly.Msg.NEW_VARIABLE);for(var b=[],c=0;c<a.length;c++)b[c]=[a[c],a[c]];return b};
 Blockly.FieldVariable.dropdownChange=function(a){function b(a,b){Blockly.hideChaff();var c=window.prompt(a,b);c&&(c=c.replace(/[\s\xa0]+/g," ").replace(/^ | $/g,""),c==Blockly.Msg.RENAME_VARIABLE||c==Blockly.Msg.NEW_VARIABLE)&&(c=null);return c}var c=this.sourceBlock_.workspace;if(a==Blockly.Msg.RENAME_VARIABLE){var d=this.getText();(a=b(Blockly.Msg.RENAME_VARIABLE_TITLE.replace("%1",d),d))&&Blockly.Variables.renameVariable(d,a,c);return null}if(a==Blockly.Msg.NEW_VARIABLE)return(a=b(Blockly.Msg.NEW_VARIABLE_TITLE,
-""))?(Blockly.Variables.renameVariable(a,a,c),a):null};Blockly.Generator=function(a){this.name_=a;this.RESERVED_WORDS_="";this.FUNCTION_NAME_PLACEHOLDER_REGEXP_=new RegExp(this.FUNCTION_NAME_PLACEHOLDER_,"g")};Blockly.Generator.NAME_TYPE="generated_function";Blockly.Generator.prototype.INFINITE_LOOP_TRAP=null;Blockly.Generator.prototype.STATEMENT_PREFIX=null;
+""))?(Blockly.Variables.renameVariable(a,a,c),a):null};Blockly.Generator=function(a){this.name_=a;this.FUNCTION_NAME_PLACEHOLDER_REGEXP_=new RegExp(this.FUNCTION_NAME_PLACEHOLDER_,"g")};Blockly.Generator.NAME_TYPE="generated_function";Blockly.Generator.prototype.INFINITE_LOOP_TRAP=null;Blockly.Generator.prototype.STATEMENT_PREFIX=null;
 Blockly.Generator.prototype.workspaceToCode=function(a){a||(console.warn("No workspace specified in workspaceToCode call.  Guessing."),a=Blockly.getMainWorkspace());var b=[];this.init(a);a=a.getTopBlocks(!0);for(var c=0,d;d=a[c];c++){var e=this.blockToCode(d);goog.isArray(e)&&(e=e[0]);e&&(d.outputConnection&&this.scrubNakedValue&&(e=this.scrubNakedValue(e)),b.push(e))}b=b.join("\n");b=this.finish(b);b=b.replace(/^\s+\n/,"");b=b.replace(/\n\s+$/,"\n");return b=b.replace(/[ \t]+\n/g,"\n")};
 Blockly.Generator.prototype.prefixLines=function(a,b){return b+a.replace(/\n(.)/g,"\n"+b+"$1")};Blockly.Generator.prototype.allNestedComments=function(a){var b=[];a=a.getDescendants();for(var c=0;c<a.length;c++){var d=a[c].getCommentText();d&&b.push(d)}b.length&&b.push("");return b.join("\n")};
 Blockly.Generator.prototype.blockToCode=function(a){if(!a)return"";if(a.disabled)return this.blockToCode(a.getNextBlock());var b=this[a.type];goog.asserts.assertFunction(b,'Language "%s" does not know how to generate code for block type "%s".',this.name_,a.type);b=b.call(a,a);if(goog.isArray(b))return[this.scrub_(a,b[0]),b[1]];if(goog.isString(b))return this.STATEMENT_PREFIX&&(b=this.STATEMENT_PREFIX.replace(/%1/g,"'"+a.id+"'")+b),this.scrub_(a,b);if(null===b)return"";goog.asserts.fail("Invalid code generated: %s",
 b)};Blockly.Generator.prototype.valueToCode=function(a,b,c){isNaN(c)&&goog.asserts.fail('Expecting valid order from block "%s".',a.type);a=a.getInputTargetBlock(b);if(!a)return"";var d=this.blockToCode(a);if(""===d)return"";goog.asserts.assertArray(d,'Expecting tuple from value block "%s".',a.type);b=d[0];d=d[1];isNaN(d)&&goog.asserts.fail('Expecting valid order from value block "%s".',a.type);b&&c<=d&&(c!=d||0!=c&&99!=c)&&(b="("+b+")");return b};
 Blockly.Generator.prototype.statementToCode=function(a,b){var c=a.getInputTargetBlock(b),d=this.blockToCode(c);goog.asserts.assertString(d,'Expecting code from statement block "%s".',c&&c.type);d&&(d=this.prefixLines(d,this.INDENT));return d};Blockly.Generator.prototype.addLoopTrap=function(a,b){this.INFINITE_LOOP_TRAP&&(a=this.INFINITE_LOOP_TRAP.replace(/%1/g,"'"+b+"'")+a);this.STATEMENT_PREFIX&&(a+=this.prefixLines(this.STATEMENT_PREFIX.replace(/%1/g,"'"+b+"'"),this.INDENT));return a};
-Blockly.Generator.prototype.INDENT="  ";Blockly.Generator.prototype.addReservedWords=function(a){this.RESERVED_WORDS_+=a+","};Blockly.Generator.prototype.FUNCTION_NAME_PLACEHOLDER_="{leCUI8hutHZI4480Dc}";Blockly.Generator.prototype.provideFunction_=function(a,b){if(!this.definitions_[a]){var c=this.variableDB_.getDistinctName(a,this.NAME_TYPE);this.functionNames_[a]=c;this.definitions_[a]=b.join("\n").replace(this.FUNCTION_NAME_PLACEHOLDER_REGEXP_,c)}return this.functionNames_[a]};Blockly.Names=function(a,b){this.variablePrefix_=b||"";this.reservedDict_=Object.create(null);if(a)for(var c=a.split(","),d=0;d<c.length;d++)this.reservedDict_[c[d]]=!0;this.reset()};Blockly.Names.prototype.reset=function(){this.db_=Object.create(null);this.dbReverse_=Object.create(null)};
+Blockly.Generator.prototype.INDENT="  ";Blockly.Generator.prototype.RESERVED_WORDS_="";Blockly.Generator.prototype.addReservedWords=function(a){this.RESERVED_WORDS_+=a+","};Blockly.Generator.prototype.FUNCTION_NAME_PLACEHOLDER_="{leCUI8hutHZI4480Dc}";Blockly.Generator.prototype.provideFunction_=function(a,b){if(!this.definitions_[a]){var c=this.variableDB_.getDistinctName(a,this.NAME_TYPE);this.functionNames_[a]=c;this.definitions_[a]=b.join("\n").replace(this.FUNCTION_NAME_PLACEHOLDER_REGEXP_,c)}return this.functionNames_[a]};Blockly.Names=function(a,b){this.variablePrefix_=b||"";this.reservedDict_=Object.create(null);if(a)for(var c=a.split(","),d=0;d<c.length;d++)this.reservedDict_[c[d]]=!0;this.reset()};Blockly.Names.prototype.reset=function(){this.db_=Object.create(null);this.dbReverse_=Object.create(null)};
 Blockly.Names.prototype.getName=function(a,b){var c=a.toLowerCase()+"_"+b,d=b==Blockly.Variables.NAME_TYPE?this.variablePrefix_:"";if(c in this.db_)return d+this.db_[c];var e=this.getDistinctName(a,b);this.db_[c]=e.substr(d.length);return e};Blockly.Names.prototype.getDistinctName=function(a,b){for(var c=this.safeName_(a),d="";this.dbReverse_[c+d]||c+d in this.reservedDict_;)d=d?d+1:2;c+=d;this.dbReverse_[c]=!0;return(b==Blockly.Variables.NAME_TYPE?this.variablePrefix_:"")+c};
 Blockly.Names.prototype.safeName_=function(a){a?(a=encodeURI(a.replace(/ /g,"_")).replace(/[^\w]/g,"_"),-1!="0123456789".indexOf(a[0])&&(a="my_"+a)):a="unnamed";return a};Blockly.Names.equals=function(a,b){return a.toLowerCase()==b.toLowerCase()};Blockly.Procedures={};Blockly.Procedures.NAME_TYPE="PROCEDURE";Blockly.Procedures.allProcedures=function(a){a=a.getAllBlocks();for(var b=[],c=[],d=0;d<a.length;d++)if(a[d].getProcedureDef){var e=a[d].getProcedureDef();e&&(e[2]?b.push(e):c.push(e))}c.sort(Blockly.Procedures.procTupleComparator_);b.sort(Blockly.Procedures.procTupleComparator_);return[c,b]};Blockly.Procedures.procTupleComparator_=function(a,b){return a[0].toLowerCase().localeCompare(b[0].toLowerCase())};
 Blockly.Procedures.findLegalName=function(a,b){if(b.isInFlyout)return a;for(;!Blockly.Procedures.isLegalName(a,b.workspace,b);){var c=a.match(/^(.*?)(\d+)$/);a=c?c[1]+(parseInt(c[2],10)+1):a+"2"}return a};Blockly.Procedures.isLegalName=function(a,b,c){b=b.getAllBlocks();for(var d=0;d<b.length;d++)if(b[d]!=c&&b[d].getProcedureDef){var e=b[d].getProcedureDef();if(Blockly.Names.equals(e[0],a))return!1}return!0};
@@ -1226,7 +1226,7 @@ Blockly.Realtime.realtimeLoader_.start()};
 Blockly.Realtime.addAuthUi_=function(a){a.style.background="url("+Blockly.pathToMedia+Blockly.Realtime.PROGRESS_URL_+") no-repeat center center";var b=goog.style.getBounds(a),c=goog.dom.createDom("div");c.id=Blockly.Realtime.rtclientOptions_.authDivElementId;var d=goog.dom.createDom("p",null,Blockly.Msg.AUTH);c.appendChild(d);d=goog.dom.createDom("button",null,"Authorize");d.id=Blockly.Realtime.rtclientOptions_.authButtonElementId;c.appendChild(d);a.appendChild(c);c.style.display="none";c.style.position=
 "relative";c.style.textAlign="center";c.style.border="1px solid";c.style.backgroundColor="#f6f9ff";c.style.borderRadius="15px";c.style.boxShadow="10px 10px 5px #888";c.style.width=b.width/3+"px";a=goog.style.getBounds(c);c.style.left=(b.width-a.width)/3+"px";c.style.top=(b.height-a.height)/4+"px";return c};
 Blockly.Realtime.updateCollabUi_=function(){if(Blockly.Realtime.collabElementId){var a=goog.dom.getElement(Blockly.Realtime.collabElementId);goog.dom.removeChildren(a);for(var b=Blockly.Realtime.document_.getCollaborators(),c=0;c<b.length;c++){var d=b[c],e=goog.dom.createDom("img",{src:d.photoUrl||Blockly.pathToMedia+Blockly.Realtime.ANONYMOUS_URL_,alt:d.displayName,title:d.displayName+(d.isMe?" ("+Blockly.Msg.ME+")":"")});e.style.backgroundColor=d.color;goog.dom.appendChild(a,e)}}};
-Blockly.Realtime.onCollaboratorJoined_=function(a){Blockly.Realtime.updateCollabUi_()};Blockly.Realtime.onCollaboratorLeft_=function(a){Blockly.Realtime.updateCollabUi_()};Blockly.Realtime.doCommand=function(a){a()};Blockly.Realtime.genUid=function(a){var b=Blockly.Realtime.sessionId_+"-"+a;return Blockly.Realtime.blocksMap_.has(b)?Blockly.Realtime.genUid("-"+a):b};Blockly.Flyout=function(a){var b=this;a.getMetrics=function(){return b.getMetrics_()};a.setMetrics=function(a){return b.setMetrics_(a)};this.workspace_=new Blockly.WorkspaceSvg(a);this.workspace_.isFlyout=!0;this.RTL=!!a.RTL;this.eventWrappers_=[];this.height_=this.width_=0;this.buttons_=[];this.listeners_=[]};Blockly.Flyout.prototype.autoClose=!0;Blockly.Flyout.prototype.CORNER_RADIUS=8;Blockly.Flyout.prototype.SCROLLBAR_PADDING=2;
+Blockly.Realtime.onCollaboratorJoined_=function(a){Blockly.Realtime.updateCollabUi_()};Blockly.Realtime.onCollaboratorLeft_=function(a){Blockly.Realtime.updateCollabUi_()};Blockly.Realtime.doCommand=function(a){a()};Blockly.Realtime.genUid=function(a){var b=Blockly.Realtime.sessionId_+"-"+a;return Blockly.Realtime.blocksMap_.has(b)?Blockly.Realtime.genUid("-"+a):b};Blockly.Flyout=function(a){var b=this;a.getMetrics=function(){return b.getMetrics_()};a.setMetrics=function(a){return b.setMetrics_(a)};this.workspace_=new Blockly.WorkspaceSvg(a);this.workspace_.isFlyout=!0;this.RTL=!!a.RTL;this.eventWrappers_=[];this.buttons_=[];this.listeners_=[]};Blockly.Flyout.prototype.autoClose=!0;Blockly.Flyout.prototype.CORNER_RADIUS=8;Blockly.Flyout.prototype.SCROLLBAR_PADDING=2;Blockly.Flyout.prototype.width_=0;Blockly.Flyout.prototype.height_=0;
 Blockly.Flyout.prototype.createDom=function(){this.svgGroup_=Blockly.createSvgElement("g",{"class":"blocklyFlyout"},null);this.svgBackground_=Blockly.createSvgElement("path",{"class":"blocklyFlyoutBackground"},this.svgGroup_);this.svgGroup_.appendChild(this.workspace_.createDom());return this.svgGroup_};
 Blockly.Flyout.prototype.init=function(a){this.targetWorkspace_=a;this.workspace_.targetWorkspace=a;this.scrollbar_=new Blockly.Scrollbar(this.workspace_,!1,!1);this.hide();Array.prototype.push.apply(this.eventWrappers_,Blockly.bindEvent_(this.svgGroup_,"wheel",this,this.wheel_));Array.prototype.push.apply(this.eventWrappers_,Blockly.bindEvent_(this.targetWorkspace_.getCanvas(),"blocklyWorkspaceChange",this,this.filterForCapacity_));Array.prototype.push.apply(this.eventWrappers_,Blockly.bindEvent_(this.svgGroup_,
 "mousedown",this,this.onMouseDown_))};Blockly.Flyout.prototype.dispose=function(){this.hide();Blockly.unbindEvent_(this.eventWrappers_);this.scrollbar_&&(this.scrollbar_.dispose(),this.scrollbar_=null);this.workspace_&&(this.workspace_.targetWorkspace=null,this.workspace_.dispose(),this.workspace_=null);this.svgGroup_&&(goog.dom.removeNode(this.svgGroup_),this.svgGroup_=null);this.targetWorkspace_=this.svgBackground_=null};
@@ -1322,6 +1322,6 @@ Blockly.selected.dispose(!0,!0))),86==a.keyCode&&Blockly.clipboardXml_&&Blockly.
 Blockly.copy_=function(a){var b=Blockly.Xml.blockToDom_(a);Blockly.Xml.deleteNext(b);var c=a.getRelativeToSurfaceXY();b.setAttribute("x",a.RTL?-c.x:c.x);b.setAttribute("y",c.y);Blockly.clipboardXml_=b;Blockly.clipboardSource_=a.workspace};Blockly.onContextMenu_=function(a){Blockly.isTargetInput_(a)||a.preventDefault()};Blockly.hideChaff=function(a){Blockly.Tooltip.hide();Blockly.WidgetDiv.hide();a||(a=Blockly.getMainWorkspace(),a.toolbox_&&a.toolbox_.flyout_&&a.toolbox_.flyout_.autoClose&&a.toolbox_.clearSelection())};
 Blockly.getMainWorkspaceMetrics_=function(){var a=Blockly.svgSize(this.options.svg);this.toolbox_&&(a.width-=this.toolbox_.width);var b=a.width-Blockly.Scrollbar.scrollbarThickness,c=a.height-Blockly.Scrollbar.scrollbarThickness;try{var d=this.getCanvas().getBBox()}catch(e){return null}var f=d.width*this.scale,g=d.height*this.scale,h=d.x*this.scale,k=d.y*this.scale;if(this.scrollbar)var l=Math.min(h-b/2,h+f-b),b=Math.max(h+f+b/2,h+b),f=Math.min(k-c/2,k+g-c),c=Math.max(k+g+c/2,k+c);else l=d.x,b=l+
 d.width,f=d.y,c=f+d.height;d=0;!this.RTL&&this.toolbox_&&(d=this.toolbox_.width);return{viewHeight:a.height,viewWidth:a.width,contentHeight:c-f,contentWidth:b-l,viewTop:-this.scrollY,viewLeft:-this.scrollX,contentTop:f,contentLeft:l,absoluteTop:0,absoluteLeft:d}};
-Blockly.setMainWorkspaceMetrics_=function(a){if(!this.scrollbar)throw"Attempt to set main workspace scroll without scrollbars.";var b=this.getMetrics();goog.isNumber(a.x)&&(this.scrollX=-b.contentWidth*a.x-b.contentLeft);goog.isNumber(a.y)&&(this.scrollY=-b.contentHeight*a.y-b.contentTop);a=this.scrollX+b.absoluteLeft;b=this.scrollY+b.absoluteTop;this.translate(a,b);this.options.gridPattern&&(this.options.gridPattern.setAttribute("x",a),this.options.gridPattern.setAttribute("y",b))};
-Blockly.doCommand=function(a){Blockly.Realtime.isEnabled?Blockly.Realtime.doCommand(a):a()};Blockly.addChangeListener=function(a){console.warn("Deprecated call to Blockly.addChangeListener, use workspace.addChangeListener instead.");return Blockly.getMainWorkspace().addChangeListener(a)};Blockly.getMainWorkspace=function(){return Blockly.mainWorkspace};goog.global.Blockly||(goog.global.Blockly={});goog.global.Blockly.getMainWorkspace=Blockly.getMainWorkspace;
+Blockly.setMainWorkspaceMetrics_=function(a){if(!this.scrollbar)throw"Attempt to set main workspace scroll without scrollbars.";var b=this.getMetrics();goog.isNumber(a.x)&&(this.scrollX=-b.contentWidth*a.x-b.contentLeft);goog.isNumber(a.y)&&(this.scrollY=-b.contentHeight*a.y-b.contentTop);a=this.scrollX+b.absoluteLeft;b=this.scrollY+b.absoluteTop;this.translate(a,b);this.options.gridPattern&&(this.options.gridPattern.setAttribute("x",a),this.options.gridPattern.setAttribute("y",b),goog.userAgent.IE&&
+this.updateGridPattern_())};Blockly.doCommand=function(a){Blockly.Realtime.isEnabled?Blockly.Realtime.doCommand(a):a()};Blockly.addChangeListener=function(a){console.warn("Deprecated call to Blockly.addChangeListener, use workspace.addChangeListener instead.");return Blockly.getMainWorkspace().addChangeListener(a)};Blockly.getMainWorkspace=function(){return Blockly.mainWorkspace};goog.global.Blockly||(goog.global.Blockly={});goog.global.Blockly.getMainWorkspace=Blockly.getMainWorkspace;
 goog.global.Blockly.addChangeListener=Blockly.addChangeListener;
\ No newline at end of file
diff --git a/blockly_uncompressed.js b/blockly_uncompressed.js
index fbeabba7e..20a689bae 100644
--- a/blockly_uncompressed.js
+++ b/blockly_uncompressed.js
@@ -27,7 +27,7 @@ if (!this.goog) {
 var dir = this.BLOCKLY_DIR.match(/[^\/]+$/)[0];
 goog.addDependency("../../../" + dir + "/core/block.js", ['Blockly.Block'], ['Blockly.Blocks', 'Blockly.Comment', 'Blockly.Connection', 'Blockly.Input', 'Blockly.Mutator', 'Blockly.Warning', 'Blockly.Workspace', 'Blockly.Xml', 'goog.array', 'goog.asserts', 'goog.math.Coordinate', 'goog.string']);
 goog.addDependency("../../../" + dir + "/core/block_svg.js", ['Blockly.BlockSvg'], ['Blockly.Block', 'Blockly.ContextMenu', 'goog.Timer', 'goog.asserts', 'goog.dom', 'goog.math.Coordinate']);
-goog.addDependency("../../../" + dir + "/core/blockly.js", ['Blockly'], ['Blockly.BlockSvg', 'Blockly.FieldAngle', 'Blockly.FieldCheckbox', 'Blockly.FieldColour', 'Blockly.FieldDropdown', 'Blockly.FieldImage', 'Blockly.FieldTextInput', 'Blockly.FieldVariable', 'Blockly.Generator', 'Blockly.Msg', 'Blockly.Procedures', 'Blockly.Realtime', 'Blockly.Toolbox', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.inject', 'Blockly.utils', 'goog.color']);
+goog.addDependency("../../../" + dir + "/core/blockly.js", ['Blockly'], ['Blockly.BlockSvg', 'Blockly.FieldAngle', 'Blockly.FieldCheckbox', 'Blockly.FieldColour', 'Blockly.FieldDropdown', 'Blockly.FieldImage', 'Blockly.FieldTextInput', 'Blockly.FieldVariable', 'Blockly.Generator', 'Blockly.Msg', 'Blockly.Procedures', 'Blockly.Realtime', 'Blockly.Toolbox', 'Blockly.WidgetDiv', 'Blockly.WorkspaceSvg', 'Blockly.inject', 'Blockly.utils', 'goog.color', 'goog.userAgent']);
 goog.addDependency("../../../" + dir + "/core/blocks.js", ['Blockly.Blocks'], ['goog.asserts']);
 goog.addDependency("../../../" + dir + "/core/bubble.js", ['Blockly.Bubble'], ['Blockly.Workspace', 'goog.dom', 'goog.math', 'goog.userAgent']);
 goog.addDependency("../../../" + dir + "/core/comment.js", ['Blockly.Comment'], ['Blockly.Bubble', 'Blockly.Icon', 'goog.userAgent']);
diff --git a/core/blockly.js b/core/blockly.js
index 7c019e9ff..0c81b57c3 100644
--- a/core/blockly.js
+++ b/core/blockly.js
@@ -51,6 +51,7 @@ goog.require('Blockly.utils');
 
 // Closure dependencies.
 goog.require('goog.color');
+goog.require('goog.userAgent');
 
 
 /**
@@ -557,6 +558,10 @@ Blockly.setMainWorkspaceMetrics_ = function(xyRatio) {
   if (this.options.gridPattern) {
     this.options.gridPattern.setAttribute('x', x);
     this.options.gridPattern.setAttribute('y', y);
+    if (goog.userAgent.IE) {
+      // IE doesn't notice that the x/y offsets have changed.  Force an update.
+      this.updateGridPattern_();
+    }
   }
 };