edit prediction: Refine subtle mode flag styles (#25157)

There's still a tiny, 1px shadow being cast in the flag pole that I
didn't figure out yet how to fix it.


https://github.com/user-attachments/assets/714da320-5995-4bd2-a0dc-6c027b4d91eb

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -5901,20 +5901,18 @@ impl Editor {
         window: &mut Window,
         cx: &App,
     ) -> Option<Div> {
-        let bg_color = Self::edit_prediction_line_popover_bg_color(cx);
-
         let padding_right = if icon.is_some() { px(4.) } else { px(8.) };
 
         let result = h_flex()
-            .gap_1()
-            .border_1()
-            .rounded_lg()
-            .shadow_sm()
-            .bg(bg_color)
-            .border_color(cx.theme().colors().text_accent.opacity(0.4))
             .py_0p5()
             .pl_1()
             .pr(padding_right)
+            .gap_1()
+            .rounded(px(6.))
+            .border_1()
+            .bg(Self::edit_prediction_line_popover_bg_color(cx))
+            .border_color(Self::edit_prediction_callout_popover_border_color(cx))
+            .shadow_sm()
             .children(self.render_edit_prediction_accept_keybind(window, cx))
             .child(Label::new(label).size(LabelSize::Small))
             .when_some(icon, |element, icon| {
@@ -5934,6 +5932,12 @@ impl Editor {
         editor_bg_color.blend(accent_color.opacity(0.1))
     }
 
+    fn edit_prediction_callout_popover_border_color(cx: &App) -> Hsla {
+        let accent_color = cx.theme().colors().text_accent;
+        let editor_bg_color = cx.theme().colors().editor_background;
+        editor_bg_color.blend(accent_color.opacity(0.6))
+    }
+
     fn render_edit_prediction_cursor_popover(
         &self,
         min_width: Pixels,
@@ -6006,10 +6010,11 @@ impl Editor {
                         h_flex()
                             .px_2()
                             .py_1()
+                            .gap_2()
                             .elevation_2(cx)
                             .border_color(cx.theme().colors().border)
+                            .rounded(px(6.))
                             .rounded_tl(px(0.))
-                            .gap_2()
                             .child(
                                 if target.text_anchor.to_point(&snapshot).row > cursor_point.row {
                                     Icon::new(IconName::ZedPredictDown)

crates/editor/src/element.rs

@@ -3628,6 +3628,7 @@ impl EditorElement {
                         const POLE_WIDTH: Pixels = px(2.);
 
                         let mut element = v_flex()
+                            .items_end()
                             .child(
                                 editor
                                     .render_edit_prediction_line_popover("Jump", None, window, cx)?
@@ -3638,10 +3639,9 @@ impl EditorElement {
                             .child(
                                 div()
                                     .w(POLE_WIDTH)
-                                    .bg(cx.theme().colors().text_accent.opacity(0.8))
+                                    .bg(Editor::edit_prediction_callout_popover_border_color(cx))
                                     .h(line_height),
                             )
-                            .items_end()
                             .into_any();
 
                         let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);