Fix widgets not redrawing correctly when updating disabled/visible state

distribution/changelog.txt

@@ -5,6 +5,7 @@
 - Fix: [#20255] Images from the last hovered-over coaster in the object selection are not freed.
 - Fix: [#20616] Confirmation button in the track designer’s quit prompt has the wrong text.
 - Fix: [#21145] [Plugin] setInterval/setTimeout handle conflict.
+- Fix: [#21157] [Plugin] Widgets do not redraw correctly when updating disabled or visibility state. 
 - Fix: [#21158] [Plugin] Potential crash using setInterval/setTimeout within the callback.
 - Fix: [#21171] [Plugin] Crash creating entities with no more entity slots available.
 - Fix: [#21178] Inca Lost City’s scenario description incorrectly states there are height restrictions.

src/openrct2-ui/scripting/ScWidget.hpp

@@ -323,6 +323,7 @@ namespace OpenRCT2::Scripting
                         WidgetSetDisabled(*w, _widgetIndex + 2, value);
                     }
                 }
+                Invalidate(widget);
             }
         }
 
@@ -355,6 +356,7 @@ namespace OpenRCT2::Scripting
                         WidgetSetVisible(*w, _widgetIndex + 2, value);
                     }
                 }
+                Invalidate(widget);
             }
         }