/**

	 * Returns a pointer to the (alphabetically) previous or next sign of the current sign.

	 * @param next false if the previous sign is wanted, true if the next sign is wanted

	 * @return pointer to the previous/next sign

	 */

	const Sign *PrevNextSign(bool next)

	{

		/* Rebuild the sign list */

		this->signs.ForceRebuild();

		this->signs.NeedResort();

		this->BuildSignsList();

		this->SortSignsList();

		/* Search through the list for the current sign, excluding

		 * - the first sign if we want the previous sign or

		 * - the last sign if we want the next sign */

		uint end = this->signs.Length() - (next ? 1 : 0);

		for (uint i = next ? 0 : 1; i < end; i++) {

			if (this->cur_sign == this->signs[i]->index) {

				/* We've found the current sign, so return the sign before/after it */

				return this->signs[i + (next ? 1 : -1)];

			}

		}

		/* If we haven't found the current sign by now, return the last/first sign */

		return this->signs[next ? 0 : this->signs.Length() - 1];

	}

			case QUERY_EDIT_SIGN_WIDGET_PREVIOUS:

			case QUERY_EDIT_SIGN_WIDGET_NEXT: {

				const Sign *si = this->PrevNextSign(widget == QUERY_EDIT_SIGN_WIDGET_NEXT);