Fix crash when selecting a character before the punctuation sign #1151
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Proposed Changes
Fix OutOfBounds logical error leading to crash. Refactor testing of caret placement to be more apparent.
Testing
Test: CupertinoTextFieldDelegateTest.determineCursorDesiredOffset_tap_before_punctuation
Issues Fixed
Fixes: JetBrains/compose-multiplatform#4388, crash in JetBrains/compose-multiplatform#4353
Note
This PR fixes the crash, the behavior is still incorrect. Consult with code owner @mazunin-v-jb.