Program: 88096
Project: 88096
Buggy source:
private void handleCharacter(final int primaryCode,final int[] keyCodes,final int x,final int y,final int spaceState){
  mVoiceProxy.handleCharacter();
  final InputConnection ic=getCurrentInputConnection();
  if (ic != null)   ic.beginBatchEdit();
  if (SPACE_STATE_MAGIC == spaceState && mSettingsValues.isMagicSpaceStripper(primaryCode)) {
    removeTrailingSpaceWhileInBatchEdit(ic);
  }
  int code=primaryCode;
  if ((isAlphabet(code) || mSettingsValues.isSymbolExcludedFromWordSeparators(code)) && isSuggestionsRequested() && !isCursorTouchingWord()) {
    if (!mHasUncommittedTypedChars) {
      mHasUncommittedTypedChars=true;
      mComposingStringBuilder.setLength(0);
      mWordComposer.reset();
      clearSuggestions();
      mComposingStateManager.onFinishComposingText();
    }
  }
  if (code == Keyboard.CODE_SINGLE_QUOTE && !isCursorTouchingWord()) {
    mHasUncommittedTypedChars=false;
  }
  final KeyboardSwitcher switcher=mKeyboardSwitcher;
  if (switcher.isShiftedOrShiftLocked()) {
    if (keyCodes == null || keyCodes[0] < Character.MIN_CODE_POINT || keyCodes[0] > Character.MAX_CODE_POINT) {
      if (null != ic)       ic.endBatchEdit();
      return;
    }
    code=keyCodes[0];
    if (switcher.isAlphabetMode() && Character.isLowerCase(code)) {
      final String upperCaseString=new String(new int[]{code},0,1).toUpperCase(mSubtypeSwitcher.getInputLocale());
      if (upperCaseString.codePointCount(0,upperCaseString.length()) == 1) {
        code=upperCaseString.codePointAt(0);
      }
 else {
        onTextInput(upperCaseString);
        if (null != ic)         ic.endBatchEdit();
        return;
      }
    }
  }
  if (mHasUncommittedTypedChars) {
    mComposingStringBuilder.append((char)code);
    mWordComposer.add(code,keyCodes,x,y);
    if (ic != null) {
      if (mWordComposer.size() == 1) {
        mWordComposer.setAutoCapitalized(getCurrentAutoCapsState());
        mComposingStateManager.onStartComposingText();
      }
      final CharSequence textWithUnderline=mComposingStateManager.isAutoCorrectionIndicatorOn() ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(this,mComposingStringBuilder) : mComposingStringBuilder;
      ic.setComposingText(textWithUnderline,1);
    }
    mHandler.postUpdateSuggestions();
  }
 else {
    sendKeyChar((char)code);
  }
  if (SPACE_STATE_MAGIC == spaceState && mSettingsValues.isMagicSpaceSwapper(primaryCode)) {
    if (null != ic)     swapSwapperAndSpaceWhileInBatchEdit(ic);
  }
  switcher.updateShiftState();
  if (LatinIME.PERF_DEBUG)   measureCps();
  TextEntryState.typedCharacter((char)code,mSettingsValues.isWordSeparator(code),x,y);
  if (null != ic)   ic.endBatchEdit();
}

Fixed version (ground truth):
private void handleCharacter(final int primaryCode,final int[] keyCodes,final int x,final int y,final int spaceState){
  mVoiceProxy.handleCharacter();
  final InputConnection ic=getCurrentInputConnection();
  if (ic != null)   ic.beginBatchEdit();
  if (SPACE_STATE_MAGIC == spaceState && mSettingsValues.isMagicSpaceStripper(primaryCode)) {
    removeTrailingSpaceWhileInBatchEdit(ic);
  }
  int code=primaryCode;
  if ((isAlphabet(code) || mSettingsValues.isSymbolExcludedFromWordSeparators(code)) && isSuggestionsRequested() && !isCursorTouchingWord()) {
    if (!mHasUncommittedTypedChars) {
      mHasUncommittedTypedChars=(Keyboard.CODE_SINGLE_QUOTE != code);
      mComposingStringBuilder.setLength(0);
      mWordComposer.reset();
      clearSuggestions();
      mComposingStateManager.onFinishComposingText();
    }
  }
  final KeyboardSwitcher switcher=mKeyboardSwitcher;
  if (switcher.isShiftedOrShiftLocked()) {
    if (keyCodes == null || keyCodes[0] < Character.MIN_CODE_POINT || keyCodes[0] > Character.MAX_CODE_POINT) {
      if (null != ic)       ic.endBatchEdit();
      return;
    }
    code=keyCodes[0];
    if (switcher.isAlphabetMode() && Character.isLowerCase(code)) {
      final String upperCaseString=new String(new int[]{code},0,1).toUpperCase(mSubtypeSwitcher.getInputLocale());
      if (upperCaseString.codePointCount(0,upperCaseString.length()) == 1) {
        code=upperCaseString.codePointAt(0);
      }
 else {
        onTextInput(upperCaseString);
        if (null != ic)         ic.endBatchEdit();
        return;
      }
    }
  }
  if (mHasUncommittedTypedChars) {
    mComposingStringBuilder.append((char)code);
    mWordComposer.add(code,keyCodes,x,y);
    if (ic != null) {
      if (mWordComposer.size() == 1) {
        mWordComposer.setAutoCapitalized(getCurrentAutoCapsState());
        mComposingStateManager.onStartComposingText();
      }
      final CharSequence textWithUnderline=mComposingStateManager.isAutoCorrectionIndicatorOn() ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(this,mComposingStringBuilder) : mComposingStringBuilder;
      ic.setComposingText(textWithUnderline,1);
    }
    mHandler.postUpdateSuggestions();
  }
 else {
    sendKeyChar((char)code);
  }
  if (SPACE_STATE_MAGIC == spaceState && mSettingsValues.isMagicSpaceSwapper(primaryCode)) {
    if (null != ic)     swapSwapperAndSpaceWhileInBatchEdit(ic);
  }
  switcher.updateShiftState();
  if (LatinIME.PERF_DEBUG)   measureCps();
  TextEntryState.typedCharacter((char)code,mSettingsValues.isWordSeparator(code),x,y);
  if (null != ic)   ic.endBatchEdit();
}