fix: make full titlebar strip draggable in dock and sidebar

crates/layout/src/dock.rs

@@ -1085,18 +1085,19 @@ fn render_pane(
                 })
                 .pr(padding_x)
                 .child(tabs)
+                .child(titlebar_strip(
+                    div()
+                        .id(SharedString::from(format!(
+                            "{dock_id}-pane-{}-strip",
+                            pane.key
+                        )))
+                        .flex_1()
+                        .self_stretch(),
+                    window,
+                    cx,
+                ))
                 .when(titlebar.window_controls, |bar| {
-                    bar.child(titlebar_strip(
-                        div()
-                            .id(SharedString::from(format!(
-                                "{dock_id}-pane-{}-strip",
-                                pane.key
-                            )))
-                            .flex_1(),
-                        window,
-                        cx,
-                    ))
-                    .child(WindowControls::new(SharedString::from(format!(
+                    bar.child(WindowControls::new(SharedString::from(format!(
                         "{dock_id}-pane-{}-controls",
                         pane.key
                     ))))

crates/layout/src/shell.rs

@@ -286,36 +286,43 @@ fn sidebar_region(
         .h(strip_height)
         .bg(strip_background)
         .items_center()
-        .justify_end()
-        .map(|strip| titlebar_strip(strip, window, cx))
         .map(|strip| match side {
             Side::Left => strip.when(cfg!(target_os = "macos"), |strip| {
                 strip.pl(px(TRAFFIC_LIGHT_PAD))
             }),
-            Side::Right => strip.child(WindowControls::new("sidebar-window-controls")),
+            Side::Right => strip,
         })
         .px(padding_x)
-        .child(
-            Button::new(SharedString::from(format!(
-                "sidebar-toggle-{}",
-                side.name()
-            )))
-            .icon(side.toggle_icon())
-            .variant(ButtonVariant::Ghost)
-            .small()
-            .accessibility_label(side.toggle_label())
-            .on_click({
-                let state = state.clone();
-                move |_, _, cx| match side {
-                    Side::Left => {
+        .child(titlebar_strip(
+            div()
+                .id(SharedString::from(format!(
+                    "sidebar-strip-drag-{}",
+                    side.name()
+                )))
+                .flex_1()
+                .self_stretch(),
+            window,
+            cx,
+        ))
+        .map(|strip| match side {
+            Side::Left => strip.child(
+                Button::new(SharedString::from(format!(
+                    "sidebar-toggle-{}",
+                    side.name()
+                )))
+                .icon(side.toggle_icon())
+                .variant(ButtonVariant::Ghost)
+                .small()
+                .accessibility_label(side.toggle_label())
+                .on_click({
+                    let state = state.clone();
+                    move |_, _, cx| {
                         state.update(cx, |state, cx| state.set_left_sidebar_visible(false, cx))
                     }
-                    Side::Right => {
-                        state.update(cx, |state, cx| state.set_right_sidebar_visible(false, cx))
-                    }
-                }
-            }),
-        );
+                }),
+            ),
+            Side::Right => strip.child(WindowControls::new("sidebar-window-controls")),
+        });
 
     v_flex()
         .w(width)

crates/layout/src/window_controls.rs

@@ -166,9 +166,7 @@ pub fn maximize_on_double_click() -> impl Fn(&ClickEvent, &mut Window, &mut App)
     }
 }
 
-/// Makes an element a titlebar strip: pressing and dragging it moves the
-/// window, double-clicking maximizes, and Windows keeps its native caption
-/// behavior through the `Drag` control area.
+/// Makes an element a titlebar strip.
 pub fn titlebar_strip(this: Stateful<Div>, window: &mut Window, cx: &mut App) -> Stateful<Div> {
     let should_move = window.use_state(cx, |_, _| false);
     this.window_control_area(WindowControlArea::Drag)

crates/layout/tests/window_controls.rs

@@ -98,8 +98,14 @@ fn the_pill_bar_pads_for_traffic_lights_when_it_leads_the_window() {
         bounds(&mut visual, "test-dock-pane-0-tabs-tab-overview").expect("tab missing");
     let padded_inset = padded_tab.left() - padded_bar.left();
 
+    // The bare bar keeps the standard leading padding; the padded bar clears
+    // the traffic lights.
     assert!(
-        padded_inset - bare_inset >= px(TRAFFIC_LIGHT_PAD) - px(1.),
+        bare_inset < px(TRAFFIC_LIGHT_PAD),
+        "the bare bar must not reserve the traffic-light pad (bare {bare_inset:?})"
+    );
+    assert!(
+        padded_inset >= px(TRAFFIC_LIGHT_PAD) - px(1.),
         "the pad must clear the traffic lights (bare {bare_inset:?}, padded {padded_inset:?})"
     );
 }