(svn r22252) [1.1] -Backport from trunk:

- Fix: Do not resort town, industry and signs list directly in OnInvalidateData(). There might be a scheduled rebuild which needs execution first. So, only set a trigger for resorting [FS#4546] (r22249, r22248, r22247, r22246, r22245, r22244, r22243, r22242, r22241, r22236, r22228, r22227, r22226)

src/smallmap_gui.cpp

@@ -1423,12 +1423,15 @@ public:
 	}
 
 	/**
-	 * Notifications for the smallmap window.
+	 * Some data on this window has become invalid.
+	 * @param data Information about the changed data.
 	 * - data = 0: Displayed industries at the industry chain window have changed.
 	 * - data = 1: Companies have changed.
+	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	virtual void OnInvalidateData(int data)
+	virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
 	{
+		if (!gui_scope) return;
 		switch (data) {
 			case 1:
 				/* The owner legend has already been rebuilt. */