Program: 8332
Project: 8332
Buggy source:
private void editSubkey(final int position){
  final long keyId=mSubkeysAdapter.getKeyId(position);
  Handler returnHandler=new Handler(){
    @Override public void handleMessage(    Message message){
switch (message.what) {
case EditSubkeyDialogFragment.MESSAGE_CHANGE_EXPIRY:
        editSubkeyExpiry(position);
      break;
case EditSubkeyDialogFragment.MESSAGE_REVOKE:
    if (mSaveKeyringParcel.mRevokeSubKeys.contains(keyId)) {
      mSaveKeyringParcel.mRevokeSubKeys.remove(keyId);
    }
 else {
      mSaveKeyringParcel.mRevokeSubKeys.add(keyId);
    }
  break;
case EditSubkeyDialogFragment.MESSAGE_STRIP:
{
  CanonicalizedSecretKey.SecretKeyType secretKeyType=mSubkeysAdapter.getSecretKeyType(position);
  if (secretKeyType == CanonicalizedSecretKey.SecretKeyType.GNU_DUMMY) {
    break;
  }
  SubkeyChange change=mSaveKeyringParcel.getSubkeyChange(keyId);
  if (change == null) {
    mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId,true,false));
    break;
  }
  change.mDummyStrip=!change.mDummyStrip;
  if (change.mDummyStrip && change.mMoveKeyToCard) {
    change.mMoveKeyToCard=false;
  }
  break;
}
case EditSubkeyDialogFragment.MESSAGE_KEYTOCARD:
{
CanonicalizedSecretKey.SecretKeyType secretKeyType=mSubkeysAdapter.getSecretKeyType(position);
if (secretKeyType == CanonicalizedSecretKey.SecretKeyType.DIVERT_TO_CARD || secretKeyType == CanonicalizedSecretKey.SecretKeyType.GNU_DUMMY) {
  Toast.makeText(EditKeyFragment.this.getActivity(),R.string.edit_key_error_bad_nfc_stripped,Toast.LENGTH_SHORT).show();
  break;
}
SubkeyChange change;
change=mSaveKeyringParcel.getSubkeyChange(keyId);
if (change == null) {
  mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId,false,true));
  break;
}
change.mMoveKeyToCard=!change.mMoveKeyToCard;
if (change.mMoveKeyToCard && change.mDummyStrip) {
  change.mDummyStrip=false;
}
break;
}
}
getLoaderManager().getLoader(LOADER_ID_SUBKEYS).forceLoad();
}
}
;
final Messenger messenger=new Messenger(returnHandler);
DialogFragmentWorkaround.INTERFACE.runnableRunDelayed(new Runnable(){
public void run(){
EditSubkeyDialogFragment dialogFragment=EditSubkeyDialogFragment.newInstance(messenger);
dialogFragment.show(getActivity().getSupportFragmentManager(),"String_Node_Str");
}
}
);
}

Fixed version (ground truth):
private void editSubkey(final int position){
  final long keyId=mSubkeysAdapter.getKeyId(position);
  Handler returnHandler=new Handler(){
    @Override public void handleMessage(    Message message){
switch (message.what) {
case EditSubkeyDialogFragment.MESSAGE_CHANGE_EXPIRY:
        editSubkeyExpiry(position);
      break;
case EditSubkeyDialogFragment.MESSAGE_REVOKE:
    if (mSaveKeyringParcel.mRevokeSubKeys.contains(keyId)) {
      mSaveKeyringParcel.mRevokeSubKeys.remove(keyId);
    }
 else {
      mSaveKeyringParcel.mRevokeSubKeys.add(keyId);
    }
  break;
case EditSubkeyDialogFragment.MESSAGE_STRIP:
{
  SecretKeyType secretKeyType=mSubkeysAdapter.getSecretKeyType(position);
  if (secretKeyType == SecretKeyType.GNU_DUMMY) {
    break;
  }
  SubkeyChange change=mSaveKeyringParcel.getSubkeyChange(keyId);
  if (change == null) {
    mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId,true,false));
    break;
  }
  change.mDummyStrip=!change.mDummyStrip;
  if (change.mDummyStrip && change.mMoveKeyToCard) {
    change.mMoveKeyToCard=false;
  }
  break;
}
case EditSubkeyDialogFragment.MESSAGE_KEYTOCARD:
{
Activity activity=EditKeyFragment.this.getActivity();
SecretKeyType secretKeyType=mSubkeysAdapter.getSecretKeyType(position);
if (secretKeyType == SecretKeyType.DIVERT_TO_CARD || secretKeyType == SecretKeyType.GNU_DUMMY) {
  Notify.create(activity,R.string.edit_key_error_bad_nfc_stripped,Notify.Style.ERROR).show((ViewGroup)activity.findViewById(R.id.import_snackbar));
  break;
}
int algorithm=mSubkeysAdapter.getAlgorithm(position);
if (algorithm != 1 && algorithm != 2 && algorithm != 3) {
  Notify.create(activity,R.string.edit_key_error_bad_nfc_algo,Notify.Style.ERROR).show((ViewGroup)activity.findViewById(R.id.import_snackbar));
  break;
}
if (mSubkeysAdapter.getKeySize(position) != 2048) {
  Notify.create(activity,R.string.edit_key_error_bad_nfc_size,Notify.Style.ERROR).show((ViewGroup)activity.findViewById(R.id.import_snackbar));
  break;
}
SubkeyChange change;
change=mSaveKeyringParcel.getSubkeyChange(keyId);
if (change == null) {
  mSaveKeyringParcel.mChangeSubKeys.add(new SubkeyChange(keyId,false,true));
  break;
}
change.mMoveKeyToCard=!change.mMoveKeyToCard;
if (change.mMoveKeyToCard && change.mDummyStrip) {
  change.mDummyStrip=false;
}
break;
}
}
getLoaderManager().getLoader(LOADER_ID_SUBKEYS).forceLoad();
}
}
;
final Messenger messenger=new Messenger(returnHandler);
DialogFragmentWorkaround.INTERFACE.runnableRunDelayed(new Runnable(){
public void run(){
EditSubkeyDialogFragment dialogFragment=EditSubkeyDialogFragment.newInstance(messenger);
dialogFragment.show(getActivity().getSupportFragmentManager(),"String_Node_Str");
}
}
);
}