PIVOT-891 (more): Fix the up/down selection logic in TextArea to do the "right" thing
by remembering the "anchor" point where the selection started and reducing / enlarging
the area depending on whether you are on one side of the anchor or the other. A
previous change fixed the left/right logic. Further changes will make these same
changes to TextPane.
Probably need to check selection logic in lists and text input fields as well.
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