Add fine-grained control for scrollbar diagnostics

assets/settings/default.json

@@ -256,8 +256,13 @@
     "search_results": true,
     // Whether to show selected symbol occurrences in the scrollbar.
     "selected_symbol": true,
-    // Whether to show diagnostic indicators in the scrollbar.
-    "diagnostics": true,
+    /// Which diagnostic indicators to show in the scrollbar.
+    ///  "none": do not show any diagnostics
+    ///  "error": show only errors
+    ///  "warning": show only errors and warnings
+    ///  "information": show only errors, warnings, and information
+    ///  "all": show all diagnostics
+    "diagnostics": "all",
     /// Forcefully enable or disable the scrollbar for each axis
     "axes": {
       /// When false, forcefully disables the horizontal scrollbar. Otherwise, obey other settings.

crates/editor/src/editor_settings.rs

@@ -105,7 +105,7 @@ pub struct Scrollbar {
     pub git_diff: bool,
     pub selected_symbol: bool,
     pub search_results: bool,
-    pub diagnostics: bool,
+    pub diagnostics: ScrollbarDiagnostics,
     pub cursors: bool,
     pub axes: ScrollbarAxes,
 }
@@ -150,6 +150,24 @@ pub struct ScrollbarAxes {
     pub vertical: bool,
 }
 
+/// Which diagnostic indicators to show in the scrollbar.
+///
+/// Default: all
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum ScrollbarDiagnostics {
+    /// Show all diagnostic levels: hint, information, warnings, error.
+    All,
+    /// Show only the following diagnostic levels: information, warning, error.
+    Information,
+    /// Show only the following diagnostic levels: warning, error.
+    Warning,
+    /// Show only the following diagnostic level: error.
+    Error,
+    /// Do not show diagnostics.
+    None,
+}
+
 /// The key to use for adding multiple cursors
 ///
 /// Default: alt
@@ -348,10 +366,10 @@ pub struct ScrollbarContent {
     ///
     /// Default: true
     pub selected_symbol: Option<bool>,
-    /// Whether to show diagnostic indicators in the scrollbar.
+    /// Which diagnostic indicators to show in the scrollbar.
     ///
-    /// Default: true
-    pub diagnostics: Option<bool>,
+    /// Default: all
+    pub diagnostics: Option<ScrollbarDiagnostics>,
     /// Whether to show cursor positions in the scrollbar.
     ///
     /// Default: true

crates/editor/src/element.rs

@@ -6,7 +6,7 @@ use crate::{
     },
     editor_settings::{
         CurrentLineHighlight, DoubleClickInMultibuffer, MultiCursorModifier, ScrollBeyondLastLine,
-        ShowScrollbar,
+        ScrollbarDiagnostics, ShowScrollbar,
     },
     git::blame::{CommitDetails, GitBlame},
     hover_popover::{
@@ -1207,7 +1207,7 @@ impl EditorElement {
                     (is_singleton && scrollbar_settings.selected_symbol && (editor.has_background_highlights::<DocumentHighlightRead>() || editor.has_background_highlights::<DocumentHighlightWrite>()))
                     ||
                     // Diagnostics
-                    (is_singleton && scrollbar_settings.diagnostics && snapshot.buffer_snapshot.has_diagnostics())
+                    (is_singleton && scrollbar_settings.diagnostics != ScrollbarDiagnostics::None && snapshot.buffer_snapshot.has_diagnostics())
                     ||
                     // Cursors out of sight
                     non_visible_cursors
@@ -4657,13 +4657,38 @@ impl EditorElement {
                                 }
                             }
 
-                            if scrollbar_settings.diagnostics {
+                            if scrollbar_settings.diagnostics != ScrollbarDiagnostics::None {
                                 let diagnostics = snapshot
                                     .buffer_snapshot
                                     .diagnostics_in_range::<_, Point>(
                                         Point::zero()..max_point,
                                         false,
                                     )
+                                    // Don't show diagnostics the user doesn't care about
+                                    .filter(|diagnostic| {
+                                        match (
+                                            scrollbar_settings.diagnostics,
+                                            diagnostic.diagnostic.severity,
+                                        ) {
+                                            (ScrollbarDiagnostics::All, _) => true,
+                                            (
+                                                ScrollbarDiagnostics::Error,
+                                                DiagnosticSeverity::ERROR,
+                                            ) => true,
+                                            (
+                                                ScrollbarDiagnostics::Warning,
+                                                DiagnosticSeverity::ERROR
+                                                | DiagnosticSeverity::WARNING,
+                                            ) => true,
+                                            (
+                                                ScrollbarDiagnostics::Information,
+                                                DiagnosticSeverity::ERROR
+                                                | DiagnosticSeverity::WARNING
+                                                | DiagnosticSeverity::INFORMATION,
+                                            ) => true,
+                                            (_, _) => false,
+                                        }
+                                    })
                                     // We want to sort by severity, in order to paint the most severe diagnostics last.
                                     .sorted_by_key(|diagnostic| {
                                         std::cmp::Reverse(diagnostic.diagnostic.severity)