[iOS/Text Input] Avoid deleting and reentering unchanged part of text. #94114
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Prevents excessive deleting and reentering text during virtual keyboard input on iOS.
Fixes #92703
Not a perfect solution, but should prevent completely meaningless
text_changedevents. For 4.4 virtual keyboard code probably should be redone and unified with IME to avoid sending synthesized keystrokes at all, and bidirectionally sync text and selection directly.