Avoid block unselection by focus leave #836
Merged
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Closes #827
Closes #763
This pull request seeks to change the behavior of block selection, tracking selection by focus entering the block, but unselection only by an escape key press or click on the editor canvas (whitespace). It also resolves an issue described in #763 where the area next to the block controls was not considered outside the toolbar (8c9ba15).
Testing instructions:
Ensure that only one block can be selected at a time, either by tabbing into or clicking on the block.
Ensure that a block only becomes unselected when (a) another block becomes selected, (b) the escape key is pressed while focusing a block, or (c) the editor whitespace is clicked.