Merge branch 'master' into jgrpp

# Conflicts:
#	.github/workflows/ci-build.yml
#	.github/workflows/release-linux.yml
#	.github/workflows/release-macos.yml
#	.github/workflows/release-windows.yml
#	.gitignore
#	COMPILING.md
#	src/company_gui.cpp
#	src/date_gui.cpp
#	src/engine.cpp
#	src/engine_func.h
#	src/fileio.cpp
#	src/linkgraph/linkgraph_gui.h
#	src/newgrf_debug_gui.cpp
#	src/newgrf_gui.cpp
#	src/order_gui.cpp
#	src/osk_gui.cpp
#	src/rail_gui.cpp
#	src/road_gui.cpp
#	src/script/api/script_event_types.hpp
#	src/sl/oldloader_sl.cpp
#	src/smallmap_gui.cpp
#	src/station_cmd.cpp
#	src/toolbar_gui.cpp
#	src/town_gui.cpp
#	src/transparency_gui.cpp
#	src/vehicle_gui.cpp
#	src/widget.cpp
#	src/widget_type.h
#	src/widgets/dropdown.cpp
#	src/widgets/dropdown_func.h
#	src/widgets/dropdown_type.h
#	src/widgets/group_widget.h
#	src/widgets/vehicle_widget.h
#	src/window.cpp
#	src/window_gui.h
#	src/window_type.h

src/main_gui.cpp

@@ -80,7 +80,7 @@ void CcGiveMoney(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2
  * @param mode Tile highlighting mode, e.g. drawing a rectangle or a dot on the ground
  * @return true if the button is clicked, false if it's unclicked
  */
-bool HandlePlacePushButton(Window *w, int widget, CursorID cursor, HighLightStyle mode)
+bool HandlePlacePushButton(Window *w, WidgetID widget, CursorID cursor, HighLightStyle mode)
 {
 	if (w->IsWidgetDisabled(widget)) return false;
 
@@ -520,7 +520,7 @@ struct MainWindow : Window
 		}
 	}
 
-	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override
+	bool OnTooltip([[maybe_unused]] Point pt, WidgetID widget, TooltipCloseCondition close_cond) override
 	{
 		if (widget != WID_M_VIEWPORT) return false;
 		return this->viewport->overlay->ShowTooltip(pt, close_cond);
@@ -538,7 +538,7 @@ struct MainWindow : Window
 		InvalidateWindowData(WC_MAIN_TOOLBAR, 0, data, true);
 	}
 
-	virtual void OnMouseOver(Point pt, int widget) override
+	virtual void OnMouseOver(Point pt, WidgetID widget) override
 	{
 		if (pt.x != -1 && _game_mode != GM_MENU && IsViewportMouseHoverActive()) {
 			/* Show tooltip with last month production or town name */