/**
	 * This used for testing whether else or else-if blocks could be inserted, or replace the selection
	 * If @p replace is true, replace selection with @p item, else insert @p item before selection
	 * Returns true if resulting instruction list passes validation
	 */
	bool GenericElseInsertionDryRun(TraceRestrictItem item, bool replace)
	{
		if (this->selected_instruction < 1) return false;
		uint offset = this->selected_instruction - 1;

		const TraceRestrictProgram *prog = this->GetProgram();
		if (!prog) return false;

		std::vector<TraceRestrictItem> items = prog->items; // copy

		if (offset >= (TraceRestrictProgram::GetInstructionCount(items) + (replace ? 0 : 1))) return false; // off the end of the program

		uint array_offset = TraceRestrictProgram::InstructionOffsetToArrayOffset(items, offset);

		if (replace) {
			bool is_dual = IsTraceRestrictDoubleItem(items[array_offset]);
			items[array_offset] = item;
			if (is_dual)
				items.erase(items.begin() + array_offset + 1);
		} else {
			items.insert(items.begin() + array_offset, item);
		}

		TraceRestrictProgramActionsUsedFlags actions_used_flags;
		return TraceRestrictProgram::Validate(items, actions_used_flags).Succeeded();
	}