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Fixes capitalized I's when emojiis are present after the text being e…

…dited. (#21951)

Summary:
Fixes #21243.
Fixes #20908.

Credit goes to superandrew213 who provided the patch based on 0.56; this commit merges and resolved the conflict introduced in 0.57.
Pull Request resolved: #21951

Differential Revision: D13980799

Pulled By: cpojer

fbshipit-source-id: 6b9f1a1ae54ad9dba043005d683d6a221472c729
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dchersey authored and facebook-github-bot committed Feb 7, 2019
1 parent 9842e39 commit f307ac7c5e3adb9b4c0f8b2e4b8cdc2f980c7733
Showing with 11 additions and 1 deletion.
  1. +11 −1 Libraries/Text/TextInput/RCTBaseTextInputView.m
@@ -105,12 +105,22 @@ - (BOOL)textOf:(NSAttributedString*)newText equals:(NSAttributedString*)oldText{
// Similarly, when the user is in the middle of inputting some text in Japanese/Chinese, there will be styling on the
// text that we should disregard. See https://developer.apple.com/documentation/uikit/uitextinput/1614489-markedtextrange?language=objc
// for more info.
// If the user added an emoji, the sytem adds a font attribute for the emoji and stores the original font in NSOriginalFont.
// Lastly, when entering a password, etc., there will be additional styling on the field as the native text view
// handles showing the last character for a split second.
__block BOOL fontHasBeenUpdatedBySystem = false;
[oldText enumerateAttribute:@"NSOriginalFont" inRange:NSMakeRange(0, oldText.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value){
fontHasBeenUpdatedBySystem = true;
}
}];

BOOL shouldFallbackToBareTextComparison =
[self.backedTextInputView.textInputMode.primaryLanguage isEqualToString:@"dictation"] ||
self.backedTextInputView.markedTextRange ||
self.backedTextInputView.isSecureTextEntry;
self.backedTextInputView.isSecureTextEntry ||
fontHasBeenUpdatedBySystem;

if (shouldFallbackToBareTextComparison) {
return ([newText.string isEqualToString:oldText.string]);
} else {

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