Program: 87376
Project: 87376
Buggy source:
/** 
 * Handle a functional key event. A functional event is a special key, like delete, shift, emoji, or the settings key. Non-special keys are those that generate a single code point. This includes all letters, digits, punctuation, separators, emoji. It excludes keys that manage keyboard-related stuff like shift, language switch, settings, layout switch, or any key that results in multiple code points like the ".com" key.
 * @param event The event to handle.
 * @param inputTransaction The transaction in progress.
 */
private void handleFunctionalEvent(final Event event,final InputTransaction inputTransaction,final int currentKeyboardScriptId,final LatinIME.UIHandler handler){
switch (event.mKeyCode) {
case Constants.CODE_DELETE:
    handleBackspaceEvent(event,inputTransaction,currentKeyboardScriptId);
  inputTransaction.setDidAffectContents();
break;
case Constants.CODE_SHIFT:
performRecapitalization(inputTransaction.mSettingsValues);
inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW);
if (mSuggestedWords.mIsPrediction) {
inputTransaction.setRequiresUpdateSuggestions();
}
break;
case Constants.CODE_CAPSLOCK:
break;
case Constants.CODE_SYMBOL_SHIFT:
break;
case Constants.CODE_SWITCH_ALPHA_SYMBOL:
break;
case Constants.CODE_SETTINGS:
onSettingsKeyPressed();
break;
case Constants.CODE_SHORTCUT:
break;
case Constants.CODE_ACTION_NEXT:
performEditorAction(EditorInfo.IME_ACTION_NEXT);
break;
case Constants.CODE_ACTION_PREVIOUS:
performEditorAction(EditorInfo.IME_ACTION_PREVIOUS);
break;
case Constants.CODE_LANGUAGE_SWITCH:
handleLanguageSwitchKey();
break;
case Constants.CODE_EMOJI:
break;
case Constants.CODE_ALPHA_FROM_EMOJI:
break;
case Constants.CODE_SHIFT_ENTER:
final Event tmpEvent=Event.createSoftwareKeypressEvent(Constants.CODE_ENTER,event.mKeyCode,event.mX,event.mY,event.isKeyRepeat());
handleNonSpecialCharacterEvent(tmpEvent,inputTransaction,handler);
inputTransaction.setDidAffectContents();
break;
default :
throw new RuntimeException("String_Node_Str" + event.mKeyCode);
}
}

Fixed version (ground truth):
/** 
 * Handle a functional key event. A functional event is a special key, like delete, shift, emoji, or the settings key. Non-special keys are those that generate a single code point. This includes all letters, digits, punctuation, separators, emoji. It excludes keys that manage keyboard-related stuff like shift, language switch, settings, layout switch, or any key that results in multiple code points like the ".com" key.
 * @param event The event to handle.
 * @param inputTransaction The transaction in progress.
 */
private void handleFunctionalEvent(final Event event,final InputTransaction inputTransaction,final int currentKeyboardScriptId,final LatinIME.UIHandler handler){
switch (event.mKeyCode) {
case Constants.CODE_DELETE:
    handleBackspaceEvent(event,inputTransaction,currentKeyboardScriptId);
  inputTransaction.setDidAffectContents();
break;
case Constants.CODE_SHIFT:
performRecapitalization(inputTransaction.mSettingsValues);
inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW);
if (mSuggestedWords.isPrediction()) {
inputTransaction.setRequiresUpdateSuggestions();
}
break;
case Constants.CODE_CAPSLOCK:
break;
case Constants.CODE_SYMBOL_SHIFT:
break;
case Constants.CODE_SWITCH_ALPHA_SYMBOL:
break;
case Constants.CODE_SETTINGS:
onSettingsKeyPressed();
break;
case Constants.CODE_SHORTCUT:
break;
case Constants.CODE_ACTION_NEXT:
performEditorAction(EditorInfo.IME_ACTION_NEXT);
break;
case Constants.CODE_ACTION_PREVIOUS:
performEditorAction(EditorInfo.IME_ACTION_PREVIOUS);
break;
case Constants.CODE_LANGUAGE_SWITCH:
handleLanguageSwitchKey();
break;
case Constants.CODE_EMOJI:
break;
case Constants.CODE_ALPHA_FROM_EMOJI:
break;
case Constants.CODE_SHIFT_ENTER:
final Event tmpEvent=Event.createSoftwareKeypressEvent(Constants.CODE_ENTER,event.mKeyCode,event.mX,event.mY,event.isKeyRepeat());
handleNonSpecialCharacterEvent(tmpEvent,inputTransaction,handler);
inputTransaction.setDidAffectContents();
break;
default :
throw new RuntimeException("String_Node_Str" + event.mKeyCode);
}
}