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/editor/src/editor_tests.rs

@@ -9,7 +9,7 @@ use crate::{
 };
 
 use futures::StreamExt;
-use gpui::{div, TestAppContext, VisualTestContext, WindowBounds, WindowOptions};
+use gpui::{div, TestAppContext, VisualTestContext, WindowOptions};
 use indoc::indoc;
 use language::{
     language_settings::{AllLanguageSettings, AllLanguageSettingsContent, LanguageSettingsContent},
@@ -6873,7 +6873,7 @@ async fn test_following(cx: &mut gpui::TestAppContext) {
     let follower = cx.update(|cx| {
         cx.open_window(
             WindowOptions {
-                bounds: WindowBounds::Fixed(Bounds::from_corners(
+                bounds: Some(Bounds::from_corners(
                     gpui::Point::new(0_f64.into(), 0_f64.into()),
                     gpui::Point::new(10_f64.into(), 80_f64.into()),
                 )),

crates/editor/src/inlay_hint_cache.rs

@@ -2664,6 +2664,7 @@ pub mod tests {
         cx.executor().run_until_parked();
         let editor =
             cx.add_window(|cx| Editor::for_multibuffer(multibuffer, Some(project.clone()), cx));
+
         let editor_edited = Arc::new(AtomicBool::new(false));
         let fake_server = fake_servers.next().await.unwrap();
         let closure_editor_edited = Arc::clone(&editor_edited);