Dismiss active diagnostics on invalidation (#25646)

When migrating to gpui2,
588976d27a (diff-a3da3181e4ab4f73aa1697d7b6dc0caa0c17b2a187fb83b076dfc0234ec91f54R21)
removed the diagnostic style for "active but invalid" case: presumably,
it served as some sort of a cursor to show where to move on after the
diagnostics update, on the next `GoTo[Prev]Diagnostic` action call.

As this change went unchanged for some time, another approach is tested
now, to be more integrated with inline diagnostics: now, the active
state is cleared

Same as before this change, another `GoTo[Prev]Diagnostic` action call
will be needed to re-expand a new diagnostics, but this change makes
this expansion to happen after the cursor — before the change, Zed would
continue from the stale diagnostics.

Release Notes:

- Fixed active diagnostics becoming stale

crates/diagnostics/src/diagnostics.rs

@@ -562,9 +562,7 @@ impl ProjectDiagnosticsEditor {
                                         )),
                                         height: diagnostic.message.matches('\n').count() as u32 + 1,
                                         style: BlockStyle::Fixed,
-                                        render: diagnostic_block_renderer(
-                                            diagnostic, None, true, true,
-                                        ),
+                                        render: diagnostic_block_renderer(diagnostic, None, true),
                                         priority: 0,
                                     });
                                 }

crates/editor/src/editor.rs

@@ -994,7 +994,7 @@ struct RegisteredInlineCompletionProvider {
     _subscription: Subscription,
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 struct ActiveDiagnosticGroup {
     primary_range: Range<Anchor>,
     primary_message: String,
@@ -12539,16 +12539,20 @@ impl Editor {
 
             if is_valid != active_diagnostics.is_valid {
                 active_diagnostics.is_valid = is_valid;
-                let mut new_styles = HashMap::default();
-                for (block_id, diagnostic) in &active_diagnostics.blocks {
-                    new_styles.insert(
-                        *block_id,
-                        diagnostic_block_renderer(diagnostic.clone(), None, true, is_valid),
-                    );
+                if is_valid {
+                    let mut new_styles = HashMap::default();
+                    for (block_id, diagnostic) in &active_diagnostics.blocks {
+                        new_styles.insert(
+                            *block_id,
+                            diagnostic_block_renderer(diagnostic.clone(), None, true),
+                        );
+                    }
+                    self.display_map.update(cx, |display_map, _cx| {
+                        display_map.replace_blocks(new_styles);
+                    });
+                } else {
+                    self.dismiss_diagnostics(cx);
                 }
-                self.display_map.update(cx, |display_map, _cx| {
-                    display_map.replace_blocks(new_styles)
-                });
             }
         }
     }
@@ -12599,7 +12603,7 @@ impl Editor {
                                 buffer.anchor_after(entry.range.start),
                             ),
                             height: message_height,
-                            render: diagnostic_block_renderer(diagnostic, None, true, true),
+                            render: diagnostic_block_renderer(diagnostic, None, true),
                             priority: 0,
                         }
                     }),
@@ -17795,7 +17799,6 @@ pub fn diagnostic_block_renderer(
     diagnostic: Diagnostic,
     max_message_rows: Option<u8>,
     allow_closing: bool,
-    _is_valid: bool,
 ) -> RenderBlock {
     let (text_without_backticks, code_ranges) =
         highlight_diagnostic_message(&diagnostic, max_message_rows);

crates/editor/src/editor_tests.rs

@@ -10970,6 +10970,106 @@ async fn cycle_through_same_place_diagnostics(
     "});
 }
 
+#[gpui::test]
+async fn active_diagnostics_dismiss_after_invalidation(
+    executor: BackgroundExecutor,
+    cx: &mut TestAppContext,
+) {
+    init_test(cx, |_| {});
+
+    let mut cx = EditorTestContext::new(cx).await;
+    let lsp_store =
+        cx.update_editor(|editor, _, cx| editor.project.as_ref().unwrap().read(cx).lsp_store());
+
+    cx.set_state(indoc! {"
+        ˇfn func(abc def: i32) -> u32 {
+        }
+    "});
+
+    let message = "Something's wrong!";
+    cx.update(|_, cx| {
+        lsp_store.update(cx, |lsp_store, cx| {
+            lsp_store
+                .update_diagnostics(
+                    LanguageServerId(0),
+                    lsp::PublishDiagnosticsParams {
+                        uri: lsp::Url::from_file_path(path!("/root/file")).unwrap(),
+                        version: None,
+                        diagnostics: vec![lsp::Diagnostic {
+                            range: lsp::Range::new(
+                                lsp::Position::new(0, 11),
+                                lsp::Position::new(0, 12),
+                            ),
+                            severity: Some(lsp::DiagnosticSeverity::ERROR),
+                            message: message.to_string(),
+                            ..Default::default()
+                        }],
+                    },
+                    &[],
+                    cx,
+                )
+                .unwrap()
+        });
+    });
+    executor.run_until_parked();
+
+    cx.update_editor(|editor, window, cx| {
+        editor.go_to_diagnostic(&GoToDiagnostic, window, cx);
+        assert_eq!(
+            editor
+                .active_diagnostics
+                .as_ref()
+                .map(|diagnostics_group| diagnostics_group.primary_message.as_str()),
+            Some(message),
+            "Should have a diagnostics group activated"
+        );
+    });
+    cx.assert_editor_state(indoc! {"
+        fn func(abcˇ def: i32) -> u32 {
+        }
+    "});
+
+    cx.update(|_, cx| {
+        lsp_store.update(cx, |lsp_store, cx| {
+            lsp_store
+                .update_diagnostics(
+                    LanguageServerId(0),
+                    lsp::PublishDiagnosticsParams {
+                        uri: lsp::Url::from_file_path(path!("/root/file")).unwrap(),
+                        version: None,
+                        diagnostics: Vec::new(),
+                    },
+                    &[],
+                    cx,
+                )
+                .unwrap()
+        });
+    });
+    executor.run_until_parked();
+    cx.update_editor(|editor, _, _| {
+        assert_eq!(
+            editor.active_diagnostics, None,
+            "After no diagnostics set to the editor, no diagnostics should be active"
+        );
+    });
+    cx.assert_editor_state(indoc! {"
+        fn func(abcˇ def: i32) -> u32 {
+        }
+    "});
+
+    cx.update_editor(|editor, window, cx| {
+        editor.go_to_diagnostic(&GoToDiagnostic, window, cx);
+        assert_eq!(
+            editor.active_diagnostics, None,
+            "Should be no diagnostics to go to and activate"
+        );
+    });
+    cx.assert_editor_state(indoc! {"
+        fn func(abcˇ def: i32) -> u32 {
+        }
+    "});
+}
+
 #[gpui::test]
 async fn test_diagnostics_with_links(cx: &mut TestAppContext) {
     init_test(cx, |_| {});