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Ensure useDragSurface is a boolean.

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Fixed #988
This commit is contained in:
marisaleung
2017-04-11 15:33:51 -07:00
parent f19b2c87aa
commit e4edc3899a
1 changed files with 1 additions and 1 deletions
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2
core/block_svg.js
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@@ -89,7 +89,7 @@ Blockly.BlockSvg = function(workspace, prototypeName, opt_id) {
* @type {boolean}
* @private
*/
this.useDragSurface_ = Blockly.utils.is3dSupported() && workspace.blockDragSurface_;
this.useDragSurface_ = Blockly.utils.is3dSupported() && !!workspace.blockDragSurface_;
Blockly.Tooltip.bindMouseEvents(this.svgPath_);
Blockly.BlockSvg.superClass_.constructor.call(this,