Program: 157309
Project: 157309
Buggy source:
private void handleDeleteLastCharacter(boolean forMultiTap){
  InputConnection ic=getCurrentInputConnection();
  if (!forMultiTap && performOnTextDeletion(ic))   return;
  boolean deleteChar=false;
  if (mPredicting) {
    final boolean wordManipulation=mWord.length() > 0 && mWord.cursorPosition() > 0;
    if (wordManipulation) {
      mWord.deleteLast();
      final int cursorPosition;
      if (mWord.cursorPosition() != mWord.length())       cursorPosition=getCursorPosition(ic);
 else       cursorPosition=-1;
      if (cursorPosition >= 0)       ic.beginBatchEdit();
      ic.setComposingText(mWord.getTypedWord(),1);
      if (mWord.length() == 0) {
        mPredicting=false;
      }
 else       if (cursorPosition >= 0) {
        ic.setSelection(cursorPosition - 1,cursorPosition - 1);
      }
      if (cursorPosition >= 0)       ic.endBatchEdit();
      postUpdateSuggestions();
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
  }
 else {
    deleteChar=true;
  }
  TextEntryState.backspace();
  if (TextEntryState.getState() == TextEntryState.State.UNDO_COMMIT) {
    revertLastWord(deleteChar);
  }
 else   if (deleteChar) {
    if (mCandidateView != null && mCandidateView.dismissAddToDictionaryHint()) {
      revertLastWord(true);
    }
 else {
      if (!forMultiTap) {
        sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
      }
 else {
        final CharSequence beforeText=ic == null ? null : ic.getTextBeforeCursor(1,0);
        final int textLengthBeforeDelete=(TextUtils.isEmpty(beforeText)) ? 0 : beforeText.length();
        if (textLengthBeforeDelete > 0)         ic.deleteSurroundingText(1,0);
 else         sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
      }
    }
  }
}

Fixed version (ground truth):
private void handleDeleteLastCharacter(boolean forMultiTap){
  InputConnection ic=getCurrentInputConnection();
  if (!forMultiTap && performOnTextDeletion(ic))   return;
  boolean deleteChar=false;
  if (mPredicting) {
    final boolean wordManipulation=mWord.length() > 0 && mWord.cursorPosition() > 0;
    if (wordManipulation) {
      mWord.deleteLast();
      final int cursorPosition;
      if (mWord.cursorPosition() != mWord.length())       cursorPosition=getCursorPosition(ic);
 else       cursorPosition=-1;
      if (cursorPosition >= 0)       ic.beginBatchEdit();
      ic.setComposingText(mWord.getTypedWord(),1);
      if (mWord.length() == 0) {
        mPredicting=false;
      }
 else       if (cursorPosition >= 0) {
        ic.setSelection(cursorPosition - 1,cursorPosition - 1);
      }
      if (cursorPosition >= 0)       ic.endBatchEdit();
      postUpdateSuggestions();
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
  }
 else {
    deleteChar=true;
  }
  TextEntryState.backspace();
  if (TextEntryState.getState() == TextEntryState.State.UNDO_COMMIT) {
    revertLastWord(deleteChar);
  }
 else   if (deleteChar) {
    if (mCandidateView != null)     mCandidateView.dismissAddToDictionaryHint();
    if (!forMultiTap) {
      sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
    }
 else {
      final CharSequence beforeText=ic == null ? null : ic.getTextBeforeCursor(1,0);
      final int textLengthBeforeDelete=(TextUtils.isEmpty(beforeText)) ? 0 : beforeText.length();
      if (textLengthBeforeDelete > 0)       ic.deleteSurroundingText(1,0);
 else       sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
    }
  }
}