Linux window decorations (#13611)

This PR adds support for full client side decorations on X11 and Wayland

TODO:
- [x] Adjust GPUI APIs to expose CSD related information
- [x] Implement remaining CSD features (Resizing, window border, window
shadow)
- [x] Integrate with existing background appearance and window
transparency
- [x] Figure out how to check if the window is tiled on X11
- [x] Implement in Zed
- [x] Repeatedly maximizing and unmaximizing can panic
- [x] Resizing is strangely slow
- [x] X11 resizing and movement doesn't work for this:
https://discord.com/channels/869392257814519848/1204679850208657418/1256816908519604305
- [x] The top corner can clip with current styling
- [x] Pressing titlebar buttons doesn't work
- [x] Not showing maximize / unmaximize buttons
- [x] Noisy transparency logs / surface transparency problem
https://github.com/zed-industries/zed/pull/13611#issuecomment-2201685030
- [x] Strange offsets when dragging the project panel
https://github.com/zed-industries/zed/pull/13611#pullrequestreview-2154606261
- [x] Shadow inset with `_GTK_FRAME_EXTENTS` doesn't respect tiling on
X11 (observe by snapping an X11 window in any direction)

Release Notes:

- N/A

---------

Co-authored-by: conrad <conrad@zed.dev>
Co-authored-by: Owen Law <81528246+someone13574@users.noreply.github.com>
Co-authored-by: apricotbucket28 <71973804+apricotbucket28@users.noreply.github.com>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/workspace/src/status_bar.rs

@@ -1,9 +1,10 @@
 use crate::{ItemHandle, Pane};
 use gpui::{
-    AnyView, IntoElement, ParentElement, Render, Styled, Subscription, View, ViewContext,
-    WindowContext,
+    AnyView, Decorations, IntoElement, ParentElement, Render, Styled, Subscription, View,
+    ViewContext, WindowContext,
 };
 use std::any::TypeId;
+use theme::CLIENT_SIDE_DECORATION_ROUNDING;
 use ui::{h_flex, prelude::*};
 use util::ResultExt;
 
@@ -40,8 +41,17 @@ impl Render for StatusBar {
             .gap(Spacing::Large.rems(cx))
             .py(Spacing::Small.rems(cx))
             .px(Spacing::Large.rems(cx))
-            // .h_8()
             .bg(cx.theme().colors().status_bar_background)
+            .map(|el| match cx.window_decorations() {
+                Decorations::Server => el,
+                Decorations::Client { tiling, .. } => el
+                    .when(!(tiling.bottom || tiling.right), |el| {
+                        el.rounded_br(CLIENT_SIDE_DECORATION_ROUNDING)
+                    })
+                    .when(!(tiling.bottom || tiling.left), |el| {
+                        el.rounded_bl(CLIENT_SIDE_DECORATION_ROUNDING)
+                    }),
+            })
             .child(self.render_left_tools(cx))
             .child(self.render_right_tools(cx))
     }