T17 Editor: CodeEditor with gutter, folds, minimap, rulers, guides, brackets, whitespace, cursors, multi-cursor, sticky scroll, inlay hints, lenses, decorations, ghost text, inline chat and diff (T17a); completions, signatures, hover, code actions, rename, references, outline, go to symbol, call and type hierarchy (T17b); find and replace, search panel and filters (T17c); problems, output, debug console, extensions, settings with JSON, keybindings, theme previews, welcome, recent projects, switcher, task runner (T17d); status items (T17e)

Shared: generic undo History, OverflowMenu icon and tooltip, StatusBarItem leading, six Lucide icons.

src/shell/bars.rs

@@ -167,6 +167,7 @@ type ClickHandler = Box<dyn Fn(&ClickEvent, &mut Window, &mut App)>;
 #[derive(IntoElement)]
 pub struct StatusBarItem {
     id: ElementId,
+    leading: Option<AnyElement>,
     icon: Option<IconName>,
     label: Option<SharedString>,
     tooltip: Option<SharedString>,
@@ -177,6 +178,7 @@ impl StatusBarItem {
     pub fn new(id: impl Into<ElementId>) -> Self {
         Self {
             id: id.into(),
+            leading: None,
             icon: None,
             label: None,
             tooltip: None,
@@ -184,6 +186,12 @@ impl StatusBarItem {
         }
     }
 
+    /// Drawn before the icon, such as a mark with a count.
+    pub fn leading(mut self, leading: impl IntoElement) -> Self {
+        self.leading = Some(leading.into_any_element());
+        self
+    }
+
     pub fn icon(mut self, icon: IconName) -> Self {
         self.icon = Some(icon);
         self
@@ -220,6 +228,7 @@ impl RenderOnce for StatusBarItem {
             .h_full()
             .px_1p5()
             .rounded(theme.radius(Radius::Sm))
+            .children(self.leading)
             .when_some(self.icon, |item, icon| {
                 item.child(
                     Icon::new(icon)