Windows: Fullscreen (#9728)

~~This is still a work in progress, but to show the public where I am
working on it~~ Ready for review

TODO:
- [x] Justify fullscreen size to display
- [x] Record and apply restored size

Release Notes:

- N/A

crates/ui/src/components/title_bar/title_bar.rs

@@ -104,8 +104,9 @@ impl RenderOnce for TitleBar {
                     .w_full()
                     .children(self.children),
             )
-            .when(self.platform_style == PlatformStyle::Windows, |title_bar| {
-                title_bar.child(WindowsWindowControls::new(height))
-            })
+            .when(
+                self.platform_style == PlatformStyle::Windows && !cx.is_fullscreen(),
+                |title_bar| title_bar.child(WindowsWindowControls::new(height)),
+            )
     }
 }