Resolved Issues:
* My drawing cleanup commit the other day broke shapekey keyframe selection - was using wrong filter for Action Editor data
* Removed the old hack to limit vertical scrolling so that shapekeys were visible. It wasn't really needed anymore, and was causing problems with HomeKey.
Unresolved Issues:
* Vertical placement of sliders is slightly off
* In a test file I obtained, shapekey sliders don't work immediately after the file is loaded.
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