Program: 88026
Project: 88026
Buggy source:
private void handleBackspaceWhileInBatchEdit(final int spaceState,final InputConnection ic){
  mVoiceProxy.handleBackspace();
  mHandler.postUpdateShiftKeyState();
  if (mEnteredText != null && sameAsTextBeforeCursor(ic,mEnteredText)) {
    ic.deleteSurroundingText(mEnteredText.length(),0);
    return;
  }
  if (mWordComposer.isComposingWord()) {
    final int length=mWordComposer.size();
    if (length > 0) {
      mWordComposer.deleteLast();
      ic.setComposingText(getTextWithUnderline(mWordComposer.getTypedWord()),1);
      if (!mWordComposer.isComposingWord()) {
        mHandler.postUpdateBigramPredictions();
      }
 else {
        mHandler.postUpdateSuggestions();
      }
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
  }
 else {
    if (mWordComposer.didAutoCorrectToAnotherWord()) {
      Utils.Stats.onAutoCorrectionCancellation();
      cancelAutoCorrect(ic);
      return;
    }
    if (SPACE_STATE_DOUBLE == spaceState) {
      if (revertDoubleSpace(ic)) {
        return;
      }
    }
 else     if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
      if (revertSwapPunctuation(ic)) {
        return;
      }
    }
    if (mSuggestionsView != null && mSuggestionsView.dismissAddToDictionaryHint()) {
      restartSuggestionsOnManuallyPickedTypedWord(ic);
    }
 else {
      ic.deleteSurroundingText(1,0);
      if (mDeleteCount > DELETE_ACCELERATE_AT) {
        ic.deleteSurroundingText(1,0);
      }
      if (isSuggestionsRequested()) {
        restartSuggestionsOnWordBeforeCursorIfAtEndOfWord(ic);
      }
    }
  }
}

Fixed version (ground truth):
private void handleBackspaceWhileInBatchEdit(final int spaceState,final InputConnection ic){
  mVoiceProxy.handleBackspace();
  mHandler.postUpdateShiftKeyState();
  if (mEnteredText != null && sameAsTextBeforeCursor(ic,mEnteredText)) {
    ic.deleteSurroundingText(mEnteredText.length(),0);
    return;
  }
  if (mWordComposer.isComposingWord()) {
    final int length=mWordComposer.size();
    if (length > 0) {
      mWordComposer.deleteLast();
      ic.setComposingText(getTextWithUnderline(mWordComposer.getTypedWord()),1);
      if (!mWordComposer.isComposingWord()) {
        mHandler.postUpdateBigramPredictions();
      }
 else {
        mHandler.postUpdateSuggestions();
      }
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
  }
 else {
    if (mWordComposer.didAutoCorrectToAnotherWord()) {
      Utils.Stats.onAutoCorrectionCancellation();
      cancelAutoCorrect(ic);
      return;
    }
    if (SPACE_STATE_DOUBLE == spaceState) {
      if (revertDoubleSpace(ic)) {
        return;
      }
    }
 else     if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
      if (revertSwapPunctuation(ic)) {
        return;
      }
    }
    if (mSuggestionsView != null && mSuggestionsView.dismissAddToDictionaryHint()) {
      restartSuggestionsOnManuallyPickedTypedWord(ic);
    }
 else {
      if (mLastSelectionStart != mLastSelectionEnd) {
        final int lengthToDelete=mLastSelectionEnd - mLastSelectionStart;
        ic.setSelection(mLastSelectionEnd,mLastSelectionEnd);
        ic.deleteSurroundingText(lengthToDelete,0);
      }
 else {
        if (NOT_A_CURSOR_POSITION == mLastSelectionEnd) {
          sendDownUpKeyEvents(KeyEvent.KEYCODE_DEL);
        }
 else {
          ic.deleteSurroundingText(1,0);
        }
        if (mDeleteCount > DELETE_ACCELERATE_AT) {
          ic.deleteSurroundingText(1,0);
        }
      }
      if (isSuggestionsRequested()) {
        restartSuggestionsOnWordBeforeCursorIfAtEndOfWord(ic);
      }
    }
  }
}