Don't send mouse events to disabled windows in wxOSX

Disabled controls are not supposed to accept any input, so don't send any
mouse events to them.

This fixes the behaviour of wxSlider which could be moved (and generated the
corresponding events) even when it was disabled.

Closes #17194.

src/osx/cocoa/window.mm

@@ -985,7 +985,9 @@ void wxOSX_mouseEvent(NSView* self, SEL _cmd, NSEvent *event)
     if (impl == NULL)
         return;
 
-    impl->mouseEvent(event, self, _cmd);
+    // We shouldn't let disabled windows get mouse events.
+    if (impl->GetWXPeer()->IsEnabled())
+        impl->mouseEvent(event, self, _cmd);
 }
 
 void wxOSX_cursorUpdate(NSView* self, SEL _cmd, NSEvent *event)