(svn r22135) -Fix [FS#4523]: When commands need to invalidate windows, process these events asynchronously before the next redraw. Calling window code directly from command scope uses wrong _current_company and might issue nested DoCommands() which interfer with the running command.

src/newgrf_debug_gui.cpp

@@ -518,7 +518,9 @@ void DeleteNewGRFInspectWindow(GrfSpecFeature feature, uint index)
 	WindowNumber wno = GetInspectWindowNumber(feature, index);
 	DeleteWindowById(WC_NEWGRF_INSPECT, wno);
 
-	/* Reinitialise the land information window to remove the "debug" sprite if needed. */
+	/* Reinitialise the land information window to remove the "debug" sprite if needed.
+	 * Note: Since we might be called from a command here, it is important to not execute
+	 * the invalidation immediatelly. The landinfo window tests commands itself. */
 	InvalidateWindowData(WC_LAND_INFO, 0, 1);
 }