* Propagate the visible state when blocks connect
This fixes#1967.
In rendered connections when connecting:
- If the superior connection is hidden this hides the newly connected block.
- If the superior connection isn't hidden it makes sure the block is visible.
In rendered connections when disconnecting:
- If the superior connection is hidden, make the disconnected block stack visible.
TODO before review:
- write tests.
- update collapsed message
* Add missing overrides
* Add tests for hidden connections and fix a bug while disposing
This is a squash and merge of a large set of changes by @BeksOmega
* Added functionality to scrolling, dragging, and zooming.
* Fixed incorrect changes to workspaceChanged function.
* Fixed comment.
* Fixed typo.
* Removed scrollbar.set calls from workspace_svg.
* Removed scrollbar.resize() call.
* Added move options to playground.
* Fixed scroll_ calls that replaced scrollbar.set calls.
* Removed this.scrollbar checks.
* Changed zoom so that it always zooms towards the coordinates. Changed isContentBounded_ to be separate from isMovable_ (b/c of the previous change zoomControls had to be added to the bounded check). Fixed scroll_() calls... again.
* Changed procedures so the Highlight definition option is only available if the workspace is moveable.
* Fixed scrollCenter so that it works with flyout toolboxes.
* Fixed zoomToFit so that it works with horizontal flyout toolboxes.
* Fixed Typo.
* Fixed bumping blocks when the workspace is not movable.
* Fixed bumping not working with left and top toolbox positions.
* Re-Added not allowing scrollCenter if the workspace is not movable. Disabled scrollCenter button for this case.
* Cleaned up formatting.
* Fixed bumping... again. Reformatted workspaceChanged a bit.
* Changed blocks to be completely bumped into the workspace.
* Reorganized metrics-getting for workspaceChanged.
* Added bumping workspace comments. Moved event checking.
* Renamed workspaceChanged to bumpObjects.
* Added a bumpObjects developer reminder.
* Added warning to zoomToFit.
* Cleaned up some text.
* Added better inline documentation.
* Fixed up inline docs.
* Cleaned up comments.
* Fixed zoomCenter not actually zooming towards the center.
* Fixed zoomControls error on unmovable bottom-toolbox workspaces
* Fixed programatically placing blocks in an unmovable workspace.
* Removed unnecessary translate call in inject.
* Reversed removal of translate. (apparently it was necessary)
* Cleaned up code in response to first round of reviews.
* Added unit comments to the zoom function.
* Removed bumpObjectsEventChecker. Added BUMP_EVENTS list to Blockly.Events.
* Changed getWorkspaceObjectMetrics call to getBoundingRectangle().
* Fixed utils.mouseToSvg (was causing problems with zoom on wheel if the page was scrolled).
* Fixed zoom when page is scrolled (actually this time). Reverted changes to utils.mouseToSvg.
* Fixed centerOnBlock.
* Added unit docs to translate. Moved setting the grid position to the translate function.
* Added TODO's.
