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/gpui/src/platform/windows/platform.rs

@@ -53,8 +53,8 @@ use windows::{
 use crate::{
     try_get_window_inner, Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CursorStyle,
     ForegroundExecutor, Keymap, Menu, PathPromptOptions, Platform, PlatformDisplay, PlatformInput,
-    PlatformTextSystem, PlatformWindow, Task, WindowAppearance, WindowOptions, WindowsDispatcher,
-    WindowsDisplay, WindowsTextSystem, WindowsWindow,
+    PlatformTextSystem, PlatformWindow, Task, WindowAppearance, WindowOptions, WindowParams,
+    WindowsDispatcher, WindowsDisplay, WindowsTextSystem, WindowsWindow,
 };
 
 pub(crate) struct WindowsPlatform {
@@ -327,15 +327,20 @@ impl Platform for WindowsPlatform {
         Some(Rc::new(WindowsDisplay::new()))
     }
 
+    // todo(windows)
+    fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>> {
+        Some(Rc::new(WindowsDisplay::new()))
+    }
+
     // todo(windows)
     fn active_window(&self) -> Option<AnyWindowHandle> {
-        unimplemented!()
+        None
     }
 
     fn open_window(
         &self,
         handle: AnyWindowHandle,
-        options: WindowOptions,
+        options: WindowParams,
     ) -> Box<dyn PlatformWindow> {
         Box::new(WindowsWindow::new(self.inner.clone(), handle, options))
     }