Select last tool for waterways and terraform toolbars

src/terraform_gui.cpp

@@ -293,6 +293,16 @@ struct TerraformToolbarWindow : Window {
 		ResetObjectToPlace();
 	}
 
+	virtual void SelectLastTool()
+	{
+		// User misplaced something - activate last selected tool again
+		if (this->last_user_action == WIDGET_LIST_END)
+			return;
+		Point dummy = {0, 0};
+		this->RaiseWidget(this->last_user_action);
+		this->OnClick(dummy, this->last_user_action, 0);
+	}
+
 	static HotkeyList hotkeys;
 };