[TextServer] Fix long selection performance. #60136
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Fixes #60107
Nested loop is not necessary since selection ranges are calculated sequentially, and merge can be done in place. And it seems to be incorrectly rebased at some point, adding a useless loop.
Selection,
Ctrl+A, or cursor movement on million chars long text in theLineEditshould be instant, pasting it and doing any edit takes about two seconds (which is expected). With text that long, carets/selection are shifted (I'll take a look, but it's probably just limitation ofVector2precision limitation).