public boolean onLongClickCheckable(@NonNull View view,
                                        @NonNull CheckableViewHolder viewHolder) {
        if (MODE_NEW_FILE == mode) {
            mEditTextFileName.setText(getName(viewHolder.file));
        }
        onClickCheckBox(viewHolder);
        return true;
    }
Long clicking a selectable item should toggle its selected state. Note that if only a
single item can be selected, then other potentially selected views on screen must be
de-selected.

@param view       which was long clicked. Not used in default implementation.
@param viewHolder for the clicked view
@return true if the callback consumed the long click, false otherwise.
android/modules/module_filepicker/src/main/java/com/nononsenseapps/filepicker/AbstractFilePickerFragment.java