Merge pull request #44168 from nkdengineer/fix/44085

[CP Staging]fix: crash app when entering mention.

(cherry picked from commit 0d147a4)

Author: rlinoz

patches/@expensify+react-native-live-markdown+0.1.85.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/@expensify/react-native-live-markdown/lib/module/web/cursorUtils.js b/node_modules/@expensify/react-native-live-markdown/lib/module/web/cursorUtils.js
+index e975fb2..6a4b510 100644
+--- a/node_modules/@expensify/react-native-live-markdown/lib/module/web/cursorUtils.js
++++ b/node_modules/@expensify/react-native-live-markdown/lib/module/web/cursorUtils.js
+@@ -53,7 +53,7 @@ function setCursorPosition(target, start, end = null) {
+         // 3. Caret at the end of whole input, when pressing enter
+         // 4. All other placements
+         if (prevChar === '\n' && prevTextLength !== undefined && prevTextLength < textCharacters.length) {
+-          if (nextChar !== '\n') {
++          if (nextChar !== '\n' && i !== n - 1 && nextChar) {
+             range.setStart(textNodes[i + 1], 0);
+           } else if (i !== textNodes.length - 1) {
+             range.setStart(textNodes[i], 1);