Open new windows with a default size and position (#9204)

This PR changes GPUI to open windows with a default size and location,
and to otherwise inherit from their spawning window.

Note: The linux build now crashes on startup.

Release Notes:

- N/A

---------

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Ezekiel Warren <zaucy@users.noreply.github.com>

crates/collab_ui/src/collab_ui.rs

@@ -13,8 +13,8 @@ use call::{report_call_event_for_room, ActiveCall};
 pub use collab_panel::CollabPanel;
 pub use collab_titlebar_item::CollabTitlebarItem;
 use gpui::{
-    actions, point, AppContext, GlobalPixels, Pixels, PlatformDisplay, Size, Task, WindowBounds,
-    WindowContext, WindowKind, WindowOptions,
+    actions, point, AppContext, GlobalPixels, Pixels, PlatformDisplay, Size, Task, WindowContext,
+    WindowKind, WindowOptions,
 };
 use panel_settings::MessageEditorSettings;
 pub use panel_settings::{
@@ -111,14 +111,15 @@ fn notification_window_options(
             ),
         size: window_size.into(),
     };
+
     WindowOptions {
-        bounds: WindowBounds::Fixed(bounds),
+        bounds: Some(bounds),
         titlebar: None,
-        center: false,
         focus: false,
         show: true,
         kind: WindowKind::PopUp,
         is_movable: false,
         display_id: Some(screen.id()),
+        fullscreen: false,
     }
 }