Recalculated route step sprite sizes when changing zoom levels

src/gfx_func.h

@@ -157,6 +157,7 @@ void SetMouseCursor(CursorID cursor, PaletteID pal);
 void SetAnimatedMouseCursor(const AnimCursor *table);
 void CursorTick();
 void UpdateCursorSize();
+void UpdateRouteStepSpriteSize();
 bool ChangeResInGame(int w, int h);
 void SortResolutions();
 bool ToggleFullScreen(bool fs);

src/gfxinit.cpp

@@ -388,7 +388,7 @@ void CheckBlitter()
 	ReInitAllWindows(false);
 }
 
-static void UpdateRouteStepSpriteSize()
+void UpdateRouteStepSpriteSize()
 {
 	extern uint _vp_route_step_width;
 	extern uint _vp_route_step_height_top;

src/settings.cpp

@@ -1252,6 +1252,7 @@ static void ZoomMinMaxChanged(int32 new_value)
 		/* Restrict GUI zoom if it is no longer available. */
 		_gui_zoom = _settings_client.gui.zoom_min;
 		UpdateCursorSize();
+		UpdateRouteStepSpriteSize();
 		UpdateFontHeightCache();
 		LoadStringWidthTable();
 	}

src/settings_gui.cpp

@@ -604,6 +604,7 @@ struct GameOptionsWindow : Window {
 					_gui_zoom_cfg = new_zoom;
 					UpdateGUIZoom();
 					UpdateCursorSize();
+					UpdateRouteStepSpriteSize();
 					UpdateAllVirtCoords();
 					FixTitleGameZoom();
 					ReInitAllWindows(true);
@@ -618,6 +619,7 @@ struct GameOptionsWindow : Window {
 					GfxClearSpriteCache();
 					_font_zoom_cfg = new_zoom;
 					UpdateGUIZoom();
+					UpdateRouteStepSpriteSize();
 					LoadStringWidthTable();
 					UpdateAllVirtCoords();
 					ReInitAllWindows(true);