editor: Add sticky scroll (#42242)

Closes #5344


https://github.com/user-attachments/assets/37ec58b0-7cf6-4eea-9b34-dccf03d3526b

Release Notes:

- Added a setting to stick scopes to the top of the editor

---------

Co-authored-by: KyleBarton <kjb@initialcapacity.io>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/settings/src/settings_content/editor.rs

@@ -96,6 +96,10 @@ pub struct EditorSettingsContent {
     /// Default: 4.0
     #[serde(serialize_with = "crate::serialize_optional_f32_with_two_decimal_places")]
     pub fast_scroll_sensitivity: Option<f32>,
+    /// Settings for sticking scopes to the top of the editor.
+    ///
+    /// Default: sticky scroll is disabled
+    pub sticky_scroll: Option<StickyScrollContent>,
     /// Whether the line numbers on editors gutter are relative or not.
     /// When "enabled" shows relative number of buffer lines, when "wrapped" shows
     /// relative number of display lines.
@@ -312,6 +316,16 @@ pub struct ScrollbarContent {
     pub axes: Option<ScrollbarAxesContent>,
 }
 
+/// Sticky scroll related settings
+#[skip_serializing_none]
+#[derive(Clone, Default, Debug, Serialize, Deserialize, JsonSchema, MergeFrom, PartialEq)]
+pub struct StickyScrollContent {
+    /// Whether sticky scroll is enabled.
+    ///
+    /// Default: false
+    pub enabled: Option<bool>,
+}
+
 /// Minimap related settings
 #[skip_serializing_none]
 #[derive(Clone, Default, Debug, Serialize, Deserialize, JsonSchema, MergeFrom, PartialEq)]

crates/settings/src/vscode_import.rs

@@ -255,6 +255,7 @@ impl VsCodeSettings {
             excerpt_context_lines: None,
             expand_excerpt_lines: None,
             fast_scroll_sensitivity: self.read_f32("editor.fastScrollSensitivity"),
+            sticky_scroll: self.sticky_scroll_content(),
             go_to_definition_fallback: None,
             gutter: self.gutter_content(),
             hide_mouse: None,
@@ -303,6 +304,12 @@ impl VsCodeSettings {
         }
     }
 
+    fn sticky_scroll_content(&self) -> Option<StickyScrollContent> {
+        skip_default(StickyScrollContent {
+            enabled: self.read_bool("editor.stickyScroll.enabled"),
+        })
+    }
+
     fn gutter_content(&self) -> Option<GutterContent> {
         skip_default(GutterContent {
             line_numbers: self.read_enum("editor.lineNumbers", |s| match s {