def onShortcutUnindentWithBackspace(self):
        """Backspace pressed, unindent
        """
        assert self._qpart.textBeforeCursor().endswith(self.text())

        charsToRemove = len(self._qpart.textBeforeCursor()) % len(self.text())
        if charsToRemove == 0:
            charsToRemove = len(self.text())

        cursor = self._qpart.textCursor()
        cursor.setPosition(cursor.position() - charsToRemove, QTextCursor.KeepAnchor)
        cursor.removeSelectedText()
def delete_category(category_id):
    category = Category.query.filter_by(id=category_id).first_or_404()

    involved_users = User.query.filter(Forum.category_id == category.id,
                                       Topic.forum_id == Forum.id,
                                       Post.user_id == User.id).all()

    category.delete(involved_users)
    flash(_("Category with all associated forums deleted."), "success")
    return redirect(url_for("management.forums"))