Program: 88069
Project: 88069
Buggy source:
private void handleBackspace(final int spaceState){
  if (mVoiceProxy.logAndRevertVoiceInput())   return;
  final InputConnection ic=getCurrentInputConnection();
  if (ic == null)   return;
  ic.beginBatchEdit();
  mVoiceProxy.handleBackspace();
  final boolean deleteChar=!mHasUncommittedTypedChars;
  if (mHasUncommittedTypedChars) {
    final int length=mWordComposer.size();
    if (length > 0) {
      mWordComposer.deleteLast();
      final CharSequence textWithUnderline=mComposingStateManager.isAutoCorrectionIndicatorOn() ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(this,mWordComposer.getTypedWord()) : mWordComposer.getTypedWord();
      ic.setComposingText(textWithUnderline,1);
      if (mWordComposer.size() == 0) {
        mHasUncommittedTypedChars=false;
      }
      if (1 == length) {
        mHandler.postUpdateBigramPredictions();
      }
 else {
        mHandler.postUpdateSuggestions();
      }
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
  }
  mHandler.postUpdateShiftKeyState();
  if (null != mWordSavedForAutoCorrectCancellation) {
    Utils.Stats.onAutoCorrectionCancellation();
    cancelAutoCorrect(ic);
    mWordSavedForAutoCorrectCancellation=null;
    ic.endBatchEdit();
    return;
  }
 else {
    mWordSavedForAutoCorrectCancellation=null;
  }
  if (SPACE_STATE_DOUBLE == spaceState) {
    if (revertDoubleSpace(ic)) {
      ic.endBatchEdit();
      return;
    }
  }
 else   if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
    if (revertSwapPunctuation(ic)) {
      ic.endBatchEdit();
      return;
    }
  }
  if (mEnteredText != null && sameAsTextBeforeCursor(ic,mEnteredText)) {
    ic.deleteSurroundingText(mEnteredText.length(),0);
  }
 else   if (deleteChar) {
    if (mSuggestionsView != null && mSuggestionsView.dismissAddToDictionaryHint()) {
      restartSuggestionsOnManuallyPickedTypedWord(ic);
    }
 else {
      ic.deleteSurroundingText(1,0);
      if (mDeleteCount > DELETE_ACCELERATE_AT) {
        ic.deleteSurroundingText(1,0);
      }
      restartSuggestionsOnWordBeforeCursorIfAtEndOfWord(ic);
    }
  }
  ic.endBatchEdit();
}

Fixed version (ground truth):
private void handleBackspace(final int spaceState){
  if (mVoiceProxy.logAndRevertVoiceInput())   return;
  final InputConnection ic=getCurrentInputConnection();
  if (ic == null)   return;
  ic.beginBatchEdit();
  mVoiceProxy.handleBackspace();
  if (mEnteredText != null && sameAsTextBeforeCursor(ic,mEnteredText)) {
    ic.deleteSurroundingText(mEnteredText.length(),0);
    ic.endBatchEdit();
    return;
  }
  final boolean deleteChar=!mHasUncommittedTypedChars;
  if (mHasUncommittedTypedChars) {
    final int length=mWordComposer.size();
    if (length > 0) {
      mWordComposer.deleteLast();
      final CharSequence textWithUnderline=mComposingStateManager.isAutoCorrectionIndicatorOn() ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(this,mWordComposer.getTypedWord()) : mWordComposer.getTypedWord();
      ic.setComposingText(textWithUnderline,1);
      if (mWordComposer.size() == 0) {
        mHasUncommittedTypedChars=false;
      }
      if (1 == length) {
        mHandler.postUpdateBigramPredictions();
      }
 else {
        mHandler.postUpdateSuggestions();
      }
    }
 else {
      ic.deleteSurroundingText(1,0);
    }
    mHandler.postUpdateShiftKeyState();
    ic.endBatchEdit();
    return;
  }
  mHandler.postUpdateShiftKeyState();
  if (null != mWordSavedForAutoCorrectCancellation) {
    Utils.Stats.onAutoCorrectionCancellation();
    cancelAutoCorrect(ic);
    mWordSavedForAutoCorrectCancellation=null;
    ic.endBatchEdit();
    return;
  }
 else {
    mWordSavedForAutoCorrectCancellation=null;
  }
  if (SPACE_STATE_DOUBLE == spaceState) {
    if (revertDoubleSpace(ic)) {
      ic.endBatchEdit();
      return;
    }
  }
 else   if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
    if (revertSwapPunctuation(ic)) {
      ic.endBatchEdit();
      return;
    }
  }
  if (deleteChar) {
    if (mSuggestionsView != null && mSuggestionsView.dismissAddToDictionaryHint()) {
      restartSuggestionsOnManuallyPickedTypedWord(ic);
    }
 else {
      ic.deleteSurroundingText(1,0);
      if (mDeleteCount > DELETE_ACCELERATE_AT) {
        ic.deleteSurroundingText(1,0);
      }
      restartSuggestionsOnWordBeforeCursorIfAtEndOfWord(ic);
    }
  }
  ic.endBatchEdit();
}