Fix triple select edge case#3669
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silamon:tripleselect
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Looked into this and it still doesn't look quite right:

Notice:
- The flash when you drag up
- The wrapped selection is only retained when you drag up
- Dragging down doesn't keep the line selected
Ideally once triple click happens that initially selected wrapped line will always be selected. We're basically after exactly what monaco does:
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Keep the length of the (wrapped) line in selectionStartLength instead of selectionEnd. Upon dragging, the selection end is modified, but the wrapped line remains selected thanks to the selectionStartLength. ( Same behavior as selecting a word. )
Tests have been adjusted to include this.
Note: Dragging still select lines, instead of wrapped lines.EDIT: Fixed as well.Fixes #3670
Related microsoft/vscode/#135567
See also #1456 (comment)