[CP] Fix crash with CJK keyboard with emoji at end of text field (#42540) #42945
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…42540) The `isRTLAtPosition` method had a bug, it used `NSInteger max = [_selectionRects count]` instead of `NSInteger max = [_selectionRects count] - 1`. But I realized we don't even need the function any more, it was used in a few places in previous iterations of flutter#36643, but in the only place remaining, we actually already have the selection rect and don't need to search for it by position. Btw as an explanation of the crash, I guess there is some mismatch between code point and character count somewhere. UIKit was asking for `caretRectForPosition:2` when we only had 1 character. This could have only crashed when floating cursor selection was used, but actually when switching to CJK keyboard, UIKit turns out to use `caretRectForPosition` to calculate something about the composing rect. Fixes flutter/flutter#128031
XilaiZhang
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Jun 17, 2023
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Cherry pick of #42540