fix window rounded on linux

crates/dock/src/stack_panel.rs

@@ -1,12 +1,13 @@
 use std::sync::Arc;
 
+use gpui::prelude::FluentBuilder;
 use gpui::{
     App, AppContext, Axis, Context, DismissEvent, Entity, EventEmitter, FocusHandle, Focusable,
     IntoElement, ParentElement, Pixels, Render, SharedString, Styled, Subscription, WeakEntity,
     Window,
 };
 use smallvec::SmallVec;
-use theme::ActiveTheme;
+use theme::{ActiveTheme, CLIENT_SIDE_DECORATION_ROUNDING};
 use ui::{h_flex, AxisExt as _, Placement};
 
 use super::{DockArea, PanelEvent};
@@ -386,7 +387,10 @@ impl Render for StackPanel {
         h_flex()
             .size_full()
             .overflow_hidden()
-            .bg(cx.theme().elevated_surface_background)
+            .bg(cx.theme().panel_background)
+            .when(cx.theme().platform.is_linux(), |this| {
+                this.rounded_br(CLIENT_SIDE_DECORATION_ROUNDING)
+            })
             .child(
                 ResizablePanelGroup::new("stack-panel-group")
                     .with_state(&self.state)

crates/dock/src/tab_panel.rs

@@ -7,7 +7,7 @@ use gpui::{
     MouseButton, ParentElement, Pixels, Render, ScrollHandle, SharedString,
     StatefulInteractiveElement, Styled, WeakEntity, Window,
 };
-use theme::{ActiveTheme, TABBAR_HEIGHT};
+use theme::{ActiveTheme, CLIENT_SIDE_DECORATION_ROUNDING, TABBAR_HEIGHT};
 use ui::button::{Button, ButtonVariants as _};
 use ui::popup_menu::{PopupMenu, PopupMenuExt};
 use ui::{h_flex, v_flex, AxisExt, IconName, Placement, Selectable, Sizable, StyledExt};
@@ -792,6 +792,9 @@ impl TabPanel {
                 div()
                     .size_full()
                     .bg(cx.theme().panel_background)
+                    .when(cx.theme().platform.is_linux(), |this| {
+                        this.rounded_b(CLIENT_SIDE_DECORATION_ROUNDING)
+                    })
                     .overflow_hidden()
                     .child(
                         active_panel