Include diagnostic info in HighlightedChunks iterator

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/theme/src/lib.rs

@@ -214,6 +214,12 @@ pub struct EditorStyle {
     pub line_number_active: Color,
     pub guest_selections: Vec<SelectionStyle>,
     pub syntax: Arc<SyntaxTheme>,
+    pub error_underline: Color,
+    pub warning_underline: Color,
+    #[serde(default)]
+    pub information_underline: Color,
+    #[serde(default)]
+    pub hint_underline: Color,
 }
 
 #[derive(Clone, Copy, Default, Deserialize)]
@@ -254,6 +260,10 @@ impl InputEditorStyle {
             line_number_active: Default::default(),
             guest_selections: Default::default(),
             syntax: Default::default(),
+            error_underline: Default::default(),
+            warning_underline: Default::default(),
+            information_underline: Default::default(),
+            hint_underline: Default::default(),
         }
     }
 }