panel: Always not show active tab style, when the dock is collapsed. (#335)

## Before

<img width="249" alt="image"
src="https://github.com/user-attachments/assets/2dfee593-1a07-4b75-913b-d2e17decb67a">

## After

<img width="271" alt="image"
src="https://github.com/user-attachments/assets/20752d04-1f25-498c-8e6e-4ff0f21401bf">

crates/ui/src/dock/dock.rs

@@ -111,6 +111,12 @@ impl Dock {
     ) -> Self {
         Self::subscribe_panel_events(dock_area.clone(), panel.clone(), cx);
 
+        if !open {
+            panel.update(cx, |panel, cx| {
+                panel.set_collapsed(true, cx);
+            });
+        }
+
         Self {
             placement,
             dock_area,
@@ -149,8 +155,7 @@ impl Dock {
     }
 
     pub fn toggle_open(&mut self, cx: &mut ViewContext<Self>) {
-        self.open = !self.open;
+        self.set_open(!self.open, cx);
-        cx.notify();
     }
 
     /// Returns the size of the Dock, the size is means the width or height of
@@ -169,6 +174,11 @@ impl Dock {
     /// Set the open state of the Dock.
     pub fn set_open(&mut self, open: bool, cx: &mut ViewContext<Self>) {
         self.open = open;
+        cx.defer(move |this, cx| {
+            this.panel.update(cx, |panel, cx| {
+                panel.set_collapsed(!open, cx);
+            });
+        });
         cx.notify();
     }
 

crates/ui/src/dock/tab_panel.rs

@@ -63,12 +63,14 @@ pub struct TabPanel {
     stack_panel: Option<View<StackPanel>>,
     pub(crate) panels: Vec<Arc<dyn PanelView>>,
     pub(crate) active_ix: usize,
-    tab_bar_scroll_handle: ScrollHandle,
-    is_zoomed: bool,
     /// If this is true, the Panel closeable will follow the active panel's closeable,
     /// otherwise this TabPanel will not able to close
     pub(crate) closeable: bool,
 
+    tab_bar_scroll_handle: ScrollHandle,
+    is_zoomed: bool,
+    is_collapsed: bool,
+
     /// When drag move, will get the placement of the panel to be split
     will_split_placement: Option<Placement>,
 }
@@ -139,6 +141,7 @@ impl TabPanel {
             tab_bar_scroll_handle: ScrollHandle::new(),
             will_split_placement: None,
             is_zoomed: false,
+            is_collapsed: false,
             closeable: true,
         }
     }
@@ -261,6 +264,11 @@ impl TabPanel {
         self.stack_panel.is_some()
     }
 
+    pub(super) fn set_collapsed(&mut self, collapsed: bool, cx: &mut ViewContext<Self>) {
+        self.is_collapsed = collapsed;
+        cx.notify();
+    }
+
     fn render_menu_button(&self, cx: &mut ViewContext<Self>) -> impl IntoElement {
         let closeable = self.closeable(cx);
         let zoomable = self.zoomable(cx);
@@ -542,7 +550,13 @@ impl TabPanel {
                 },
             )
             .children(self.panels.iter().enumerate().map(|(ix, panel)| {
-                let active = ix == self.active_ix;
+                let mut active = ix == self.active_ix;
+
+                // Always not show active tab style, if the panel is collapsed
+                if self.is_collapsed {
+                    active = false;
+                }
+
                 Tab::new(("tab", ix), panel.title(cx))
                     .py_2()
                     .selected(active)