merged previous stuffs on master

crates/ui/src/list/separator_item.rs

@@ -0,0 +1,50 @@
+use gpui::{AnyElement, ParentElement, RenderOnce, StyleRefinement};
+use smallvec::SmallVec;
+
+use crate::list::ListItem;
+use crate::{Selectable, StyledExt};
+
+pub struct ListSeparatorItem {
+    style: StyleRefinement,
+    children: SmallVec<[AnyElement; 2]>,
+}
+
+impl ListSeparatorItem {
+    pub fn new() -> Self {
+        Self {
+            style: StyleRefinement::default(),
+            children: SmallVec::new(),
+        }
+    }
+}
+
+impl Default for ListSeparatorItem {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl ParentElement for ListSeparatorItem {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.children.extend(elements);
+    }
+}
+
+impl Selectable for ListSeparatorItem {
+    fn selected(self, _: bool) -> Self {
+        self
+    }
+
+    fn is_selected(&self) -> bool {
+        false
+    }
+}
+
+impl RenderOnce for ListSeparatorItem {
+    fn render(self, _: &mut gpui::Window, _: &mut gpui::App) -> impl gpui::IntoElement {
+        ListItem::new("separator")
+            .refine_style(&self.style)
+            .children(self.children)
+            .disabled(true)
+    }
+}