Resizing terminal is causing selected content to shift

[Tyriar]

VS Code issue: microsoft/vscode#238273

[jerch]

Oh well, this looks like a non-trivial issue to me. The question here is - how should the selection reflow at all?

Basically I'd suggest, that if the selection is strictly starting/ending on text holding cells, reflow selection with that text content (kinda trivial default case).

Next the question is - what should happen, if the selection starts/ends on empty cells? Ideas:

• if the empty start/end cell will be preserved by reflow (thats the case, if text is following later in that line*), just do default scheme
• if the empty cell is right of any text in a line*, things will get stripped away by reflow - maybe try to preverse selected empty cell amount clamped to max row length (thus might be shorter if the row ends up being shorter than before)

[*] line here means real text lines, thus taking wrapping into account

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Edit: A much simpler solution might be to just clear selections alway on resize, thus it cannot be carried over on resize.