update drag handler

crates/dock/src/tab_panel.rs

@@ -24,6 +24,11 @@ use signed_ui::title_bar_drag_handlers;
 use crate::dock_area::SkinShared;
 use crate::{TAB_BAR_HEIGHT, t, window_controls};
 
+/// A rough size for the drag preview, reported to base so a drop placeholder
+/// knows where to fly in from.
+///
+/// The preview itself fits its content, so this is an estimate used only to
+/// place the placeholder.
 const DRAG_PREVIEW_SIZE: gpui::Size<gpui::Pixels> = size(px(96.), px(30.));
 const COLLAPSED_TAB_BAR_SELECTOR: &str = "signed-dock-collapsed-tab-bar";
 const ACTIVE_TAB_SELECTOR: &str = "signed-dock-active-tab";
@@ -45,23 +50,21 @@ pub(crate) fn panel_title(
 /// The preview that follows the cursor while a panel is dragged.
 ///
 /// Base's `DragPanel` is the payload and draws nothing, this is the appearance half.
+/// It fits its content rather than a fixed width, so a long title is never cut off.
 struct DragPanelPreview {
     panel: Arc<dyn BasePanelView>,
 }
 
 impl Render for DragPanelPreview {
     fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
-        div()
+        h_flex()
             .id("drag-panel")
             .cursor_grab()
-            .py_1()
-            .px_3()
-            .w_24()
-            .overflow_hidden()
+            .p_1()
             .whitespace_nowrap()
             .border_1()
             .border_color(cx.theme().border)
-            .rounded(cx.theme().radius)
+            .rounded(cx.theme().radius_lg)
             .text_color(cx.theme().tab_foreground)
             .bg(cx.theme().tokens.tab_active)
             .opacity(0.75)