editor: Add active match highlight for buffer and project search (#44098)

Closes #28617

<img width="400" alt="image"
src="https://github.com/user-attachments/assets/b1c2880c-5744-4bed-a687-5c5e7aa7fef5"
/>

Release Notes:

- Improved visibility of the currently active match when browsing
results in buffer or project search.

---------

Co-authored-by: DarkMatter-999 <darkmatter999official@gmail.com>

crates/theme/src/default_colors.rs

@@ -91,6 +91,7 @@ impl ThemeColors {
             tab_inactive_background: neutral().light().step_2(),
             tab_active_background: neutral().light().step_1(),
             search_match_background: neutral().light().step_5(),
+            search_active_match_background: neutral().light().step_7(),
             panel_background: neutral().light().step_2(),
             panel_focused_border: blue().light().step_10(),
             panel_indent_guide: neutral().light_alpha().step_5(),
@@ -228,6 +229,7 @@ impl ThemeColors {
             tab_inactive_background: neutral().dark().step_2(),
             tab_active_background: neutral().dark().step_1(),
             search_match_background: neutral().dark().step_5(),
+            search_active_match_background: neutral().dark().step_3(),
             panel_background: neutral().dark().step_2(),
             panel_focused_border: blue().dark().step_8(),
             panel_indent_guide: neutral().dark_alpha().step_4(),

crates/theme/src/fallback_themes.rs

@@ -152,6 +152,7 @@ pub(crate) fn zed_default_dark() -> Theme {
                 tab_inactive_background: bg,
                 tab_active_background: editor,
                 search_match_background: bg,
+                search_active_match_background: bg,
 
                 editor_background: editor,
                 editor_gutter_background: editor,

crates/theme/src/schema.rs

@@ -287,6 +287,15 @@ pub fn theme_colors_refinement(
         .panel_background
         .as_ref()
         .and_then(|color| try_parse_color(color).ok());
+    let search_match_background = this
+        .search_match_background
+        .as_ref()
+        .and_then(|color| try_parse_color(color).ok());
+    let search_active_match_background = this
+        .search_active_match_background
+        .as_ref()
+        .and_then(|color| try_parse_color(color).ok())
+        .or(search_match_background);
     ThemeColorsRefinement {
         border,
         border_variant: this
@@ -442,10 +451,8 @@ pub fn theme_colors_refinement(
             .tab_active_background
             .as_ref()
             .and_then(|color| try_parse_color(color).ok()),
-        search_match_background: this
-            .search_match_background
-            .as_ref()
-            .and_then(|color| try_parse_color(color).ok()),
+        search_match_background: search_match_background,
+        search_active_match_background: search_active_match_background,
         panel_background,
         panel_focused_border: this
             .panel_focused_border

crates/theme/src/styles/colors.rs

@@ -128,6 +128,7 @@ pub struct ThemeColors {
     pub tab_inactive_background: Hsla,
     pub tab_active_background: Hsla,
     pub search_match_background: Hsla,
+    pub search_active_match_background: Hsla,
     pub panel_background: Hsla,
     pub panel_focused_border: Hsla,
     pub panel_indent_guide: Hsla,
@@ -352,6 +353,7 @@ pub enum ThemeColorField {
     TabInactiveBackground,
     TabActiveBackground,
     SearchMatchBackground,
+    SearchActiveMatchBackground,
     PanelBackground,
     PanelFocusedBorder,
     PanelIndentGuide,
@@ -467,6 +469,7 @@ impl ThemeColors {
             ThemeColorField::TabInactiveBackground => self.tab_inactive_background,
             ThemeColorField::TabActiveBackground => self.tab_active_background,
             ThemeColorField::SearchMatchBackground => self.search_match_background,
+            ThemeColorField::SearchActiveMatchBackground => self.search_active_match_background,
             ThemeColorField::PanelBackground => self.panel_background,
             ThemeColorField::PanelFocusedBorder => self.panel_focused_border,
             ThemeColorField::PanelIndentGuide => self.panel_indent_guide,