[ WIP ] Selecting with a mouse or API should work correctly - selecting with keyboard still needs updating
[ WIP ] Update for the previous fix (selecting with keyboard still not working correctly)
[ WIP ] fix for tests failing
[WIP] keyboard selection should work fine, tests needed
Some tests added #HOT-14
Merge branch 'feature/hot-14' into develop

Conflicts:
	src/plugins/mergeCells/mergeCells.js
	src/plugins/mergeCells/test/MergeCells.canMergeRange.spec.js