Fix iOS keyboard crash (#10656)
Fixes an iOS crash on physical devices in `-[__NSCFString substringWithRange:]`: range out of bounds. According to Apple's docs for `UITextInput` method `positionFromPosition:(UITextPosition*)position offset:(NSInteger)offset`, this method should return: A custom UITextPosition object that represents the location in a document that is at the specified offset from position. Return nil if the computed text position is less than 0 or greater than the length of the backing string.
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