(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/misc_gui.cpp

@@ -199,6 +199,7 @@ public:
 		if (c != NULL) {
 			Money old_money = c->money;
 			c->money = INT64_MAX;
+			assert(_current_company == _local_company);
 			CommandCost costclear = DoCommand(tile, 0, 0, DC_NONE, CMD_LANDSCAPE_CLEAR);
 			c->money = old_money;
 			if (costclear.Succeeded()) {