Merge tag '12.0-beta1' into jgrpp-beta

# Conflicts:
#	CMakeLists.txt
#	bin/ai/CMakeLists.txt
#	bin/game/CMakeLists.txt
#	src/build_vehicle_gui.cpp
#	src/console_cmds.cpp
#	src/core/overflowsafe_type.hpp
#	src/fios.cpp
#	src/lang/english.txt
#	src/lang/german.txt
#	src/lang/korean.txt
#	src/lang/polish.txt
#	src/network/core/game_info.cpp
#	src/network/core/game_info.h
#	src/network/core/tcp_game.cpp
#	src/network/core/tcp_game.h
#	src/network/network.cpp
#	src/network/network_client.cpp
#	src/network/network_client.h
#	src/network/network_coordinator.cpp
#	src/network/network_gui.cpp
#	src/network/network_server.cpp
#	src/network/network_server.h
#	src/newgrf_engine.cpp
#	src/openttd.cpp
#	src/rev.cpp.in
#	src/settings_type.h
#	src/train.h
#	src/train_cmd.cpp

src/build_vehicle_gui.cpp

@@ -1788,7 +1788,10 @@ struct BuildVehicleWindow : BuildVehicleWindowBase {
 		this->GenerateBuildList();
 		this->vscroll->SetCount((uint)this->eng_list.size());
 
-		this->SetWidgetsDisabledState(this->sel_engine == INVALID_ENGINE, WID_BV_SHOW_HIDE, WID_BV_BUILD, WID_BV_RENAME, WIDGET_LIST_END);
+		this->SetWidgetsDisabledState(this->sel_engine == INVALID_ENGINE, WID_BV_SHOW_HIDE, WID_BV_BUILD, WIDGET_LIST_END);
+
+		/* Disable renaming engines in network games if you are not the server. */
+		this->SetWidgetDisabledState(WID_BV_RENAME, this->sel_engine == INVALID_ENGINE || (_networking && !_network_server));
 
 		/* disable renaming engines in network games if you are not the server */
 		this->SetWidgetDisabledState(WID_BV_RENAME, _networking && !(_network_server || _network_settings_access));