Program: 41110
Project: 41110
Buggy source:
/** 
 * Return a bit mask of the differences between this Configuration object and the given one.  Does not change the values of either.  Any undefined fields in <var>delta</var> are ignored.
 * @return Returns a bit mask indicating which configurationvalues has changed, containing any combination of {@link android.content.pm.ActivityInfo#CONFIG_FONT_SCALE PackageManager.ActivityInfo.CONFIG_FONT_SCALE},  {@link android.content.pm.ActivityInfo#CONFIG_MCC PackageManager.ActivityInfo.CONFIG_MCC},  {@link android.content.pm.ActivityInfo#CONFIG_MNC PackageManager.ActivityInfo.CONFIG_MNC},  {@link android.content.pm.ActivityInfo#CONFIG_LOCALE PackageManager.ActivityInfo.CONFIG_LOCALE},  {@link android.content.pm.ActivityInfo#CONFIG_TOUCHSCREEN PackageManager.ActivityInfo.CONFIG_TOUCHSCREEN},  {@link android.content.pm.ActivityInfo#CONFIG_KEYBOARD PackageManager.ActivityInfo.CONFIG_KEYBOARD},  {@link android.content.pm.ActivityInfo#CONFIG_NAVIGATION PackageManager.ActivityInfo.CONFIG_NAVIGATION},  {@link android.content.pm.ActivityInfo#CONFIG_ORIENTATION PackageManager.ActivityInfo.CONFIG_ORIENTATION}, or  {@link android.content.pm.ActivityInfo#CONFIG_SCREEN_LAYOUT PackageManager.ActivityInfo.CONFIG_SCREEN_LAYOUT}.
 */
public int diff(Configuration delta){
  int changed=0;
  if (delta.fontScale > 0 && fontScale != delta.fontScale) {
    changed|=ActivityInfo.CONFIG_FONT_SCALE;
  }
  if (delta.mcc != 0 && mcc != delta.mcc) {
    changed|=ActivityInfo.CONFIG_MCC;
  }
  if (delta.mnc != 0 && mnc != delta.mnc) {
    changed|=ActivityInfo.CONFIG_MNC;
  }
  if (delta.locale != null && (locale == null || !locale.equals(delta.locale))) {
    changed|=ActivityInfo.CONFIG_LOCALE;
  }
  if (delta.touchscreen != TOUCHSCREEN_UNDEFINED && touchscreen != delta.touchscreen) {
    changed|=ActivityInfo.CONFIG_TOUCHSCREEN;
  }
  if (delta.keyboard != KEYBOARD_UNDEFINED && keyboard != delta.keyboard) {
    changed|=ActivityInfo.CONFIG_KEYBOARD;
  }
  if (delta.keyboardHidden != KEYBOARDHIDDEN_UNDEFINED && keyboardHidden != delta.keyboardHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.hardKeyboardHidden != HARDKEYBOARDHIDDEN_UNDEFINED && hardKeyboardHidden != delta.hardKeyboardHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.navigation != NAVIGATION_UNDEFINED && navigation != delta.navigation) {
    changed|=ActivityInfo.CONFIG_NAVIGATION;
  }
  if (delta.navigationHidden != NAVIGATIONHIDDEN_UNDEFINED && navigationHidden != delta.navigationHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.orientation != ORIENTATION_UNDEFINED && orientation != delta.orientation) {
    changed|=ActivityInfo.CONFIG_ORIENTATION;
  }
  if (delta.screenLayout != SCREENLAYOUT_SIZE_UNDEFINED && screenLayout != delta.screenLayout) {
    changed|=ActivityInfo.CONFIG_SCREEN_LAYOUT;
  }
  if (delta.uiMode != (UI_MODE_TYPE_UNDEFINED | UI_MODE_NIGHT_UNDEFINED) && uiMode != delta.uiMode) {
    changed|=ActivityInfo.CONFIG_UI_MODE;
  }
  if (!CustomTheme.nullSafeEquals(delta.customTheme,customTheme)) {
    changed|=ActivityInfo.CONFIG_THEME_RESOURCE;
  }
  return changed;
}

Fixed version (ground truth):
/** 
 * Return a bit mask of the differences between this Configuration object and the given one.  Does not change the values of either.  Any undefined fields in <var>delta</var> are ignored.
 * @return Returns a bit mask indicating which configurationvalues has changed, containing any combination of {@link android.content.pm.ActivityInfo#CONFIG_FONT_SCALE PackageManager.ActivityInfo.CONFIG_FONT_SCALE},  {@link android.content.pm.ActivityInfo#CONFIG_MCC PackageManager.ActivityInfo.CONFIG_MCC},  {@link android.content.pm.ActivityInfo#CONFIG_MNC PackageManager.ActivityInfo.CONFIG_MNC},  {@link android.content.pm.ActivityInfo#CONFIG_LOCALE PackageManager.ActivityInfo.CONFIG_LOCALE},  {@link android.content.pm.ActivityInfo#CONFIG_TOUCHSCREEN PackageManager.ActivityInfo.CONFIG_TOUCHSCREEN},  {@link android.content.pm.ActivityInfo#CONFIG_KEYBOARD PackageManager.ActivityInfo.CONFIG_KEYBOARD},  {@link android.content.pm.ActivityInfo#CONFIG_NAVIGATION PackageManager.ActivityInfo.CONFIG_NAVIGATION},  {@link android.content.pm.ActivityInfo#CONFIG_ORIENTATION PackageManager.ActivityInfo.CONFIG_ORIENTATION}, or  {@link android.content.pm.ActivityInfo#CONFIG_SCREEN_LAYOUT PackageManager.ActivityInfo.CONFIG_SCREEN_LAYOUT}.
 */
public int diff(Configuration delta){
  int changed=0;
  if (delta.fontScale > 0 && fontScale != delta.fontScale) {
    changed|=ActivityInfo.CONFIG_FONT_SCALE;
  }
  if (delta.mcc != 0 && mcc != delta.mcc) {
    changed|=ActivityInfo.CONFIG_MCC;
  }
  if (delta.mnc != 0 && mnc != delta.mnc) {
    changed|=ActivityInfo.CONFIG_MNC;
  }
  if (delta.locale != null && (locale == null || !locale.equals(delta.locale))) {
    changed|=ActivityInfo.CONFIG_LOCALE;
  }
  if (delta.touchscreen != TOUCHSCREEN_UNDEFINED && touchscreen != delta.touchscreen) {
    changed|=ActivityInfo.CONFIG_TOUCHSCREEN;
  }
  if (delta.keyboard != KEYBOARD_UNDEFINED && keyboard != delta.keyboard) {
    changed|=ActivityInfo.CONFIG_KEYBOARD;
  }
  if (delta.keyboardHidden != KEYBOARDHIDDEN_UNDEFINED && keyboardHidden != delta.keyboardHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.hardKeyboardHidden != HARDKEYBOARDHIDDEN_UNDEFINED && hardKeyboardHidden != delta.hardKeyboardHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.navigation != NAVIGATION_UNDEFINED && navigation != delta.navigation) {
    changed|=ActivityInfo.CONFIG_NAVIGATION;
  }
  if (delta.navigationHidden != NAVIGATIONHIDDEN_UNDEFINED && navigationHidden != delta.navigationHidden) {
    changed|=ActivityInfo.CONFIG_KEYBOARD_HIDDEN;
  }
  if (delta.orientation != ORIENTATION_UNDEFINED && orientation != delta.orientation) {
    changed|=ActivityInfo.CONFIG_ORIENTATION;
  }
  if (delta.screenLayout != SCREENLAYOUT_SIZE_UNDEFINED && screenLayout != delta.screenLayout) {
    changed|=ActivityInfo.CONFIG_SCREEN_LAYOUT;
  }
  if (delta.uiMode != (UI_MODE_TYPE_UNDEFINED | UI_MODE_NIGHT_UNDEFINED) && uiMode != delta.uiMode) {
    changed|=ActivityInfo.CONFIG_UI_MODE;
  }
  if (delta.customTheme != null && (customTheme == null || !customTheme.equals(delta.customTheme))) {
    changed|=ActivityInfo.CONFIG_THEME_RESOURCE;
  }
  return changed;
}