Fix failing tests

Also:
- Address comments in PR
- Add changelog note

extensions/ql-vscode/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [UNRELEASED]
 
+- Fix a bug when re-importing test databases that erroneously showed old source code. [#3616](https://github.com/github/vscode-codeql/pull/3616)
+
 ## 1.13.0 - 1 May 2024
 
 - Add Ruby support to the CodeQL Model Editor. [#3584](https://github.com/github/vscode-codeql/pull/3584)

extensions/ql-vscode/src/common/vscode/archive-filesystem-provider.ts

@@ -244,8 +244,6 @@ export class ArchiveFileSystemProvider implements FileSystemProvider {
 
   root = new Directory("");
 
-  constructor() {}
-
   flushCache(zipPath: string) {
     this.archives.delete(zipPath);
   }
@@ -363,17 +361,19 @@ export class ArchiveFileSystemProvider implements FileSystemProvider {
  */
 export const zipArchiveScheme = "codeql-zip-archive";
 
-export function activate(ctx: ExtensionContext, dbm: DatabaseManager) {
+export function activate(ctx: ExtensionContext, dbm?: DatabaseManager) {
   const afsp = new ArchiveFileSystemProvider();
-  ctx.subscriptions.push(
-    dbm.onDidChangeDatabaseItem(async ({ kind, item: db }) => {
-      if (kind === DatabaseEventKind.Remove) {
-        if (db?.sourceArchive) {
-          afsp.flushCache(db.sourceArchive.fsPath);
+  if (dbm) {
+    ctx.subscriptions.push(
+      dbm.onDidChangeDatabaseItem(async ({ kind, item: db }) => {
+        if (kind === DatabaseEventKind.Remove) {
+          if (db?.sourceArchive) {
+            afsp.flushCache(db.sourceArchive.fsPath);
+          }
         }
-      }
-    }),
-  );
+      }),
+    );
+  }
 
   ctx.subscriptions.push(
     // When a file system archive is removed from the workspace, we should

extensions/ql-vscode/src/databases/local-databases/database-events.ts

@@ -18,6 +18,6 @@ export interface DatabaseChangedEvent {
   item: DatabaseItem | undefined;
   // If true, event handlers should consider the database manager
   // to have been fully refreshed. Any state managed by the
-  /// event handler shouuld be fully refreshed as well.
+  // event handler shouuld be fully refreshed as well.
   fullRefresh: boolean;
 }

extensions/ql-vscode/src/databases/local-databases/database-manager.ts

@@ -722,7 +722,6 @@ export class DatabaseManager extends DisposableObject {
       );
     }
 
-    // note that we use undefined as the item in order to reset the entire tree
     this._onDidChangeDatabaseItem.fire({
       item,
       kind: DatabaseEventKind.Remove,

extensions/ql-vscode/test/vscode-tests/minimal-workspace/local-queries/local-databases.test.ts

@@ -140,7 +140,8 @@ describe("local databases", () => {
       },
     ]);
     expect(onDidChangeDatabaseItem).toHaveBeenCalledWith({
-      item: undefined,
+      fullRefresh: true,
+      item: mockDbItem,
       kind: DatabaseEventKind.Add,
     });
 
@@ -152,7 +153,8 @@ describe("local databases", () => {
     expect((databaseManager as any)._databaseItems).toEqual([]);
     expect(updateSpy).toHaveBeenCalledWith("databaseList", []);
     expect(onDidChangeDatabaseItem).toHaveBeenCalledWith({
-      item: undefined,
+      fullRefresh: true,
+      item: mockDbItem,
       kind: DatabaseEventKind.Remove,
     });
   });
@@ -175,7 +177,8 @@ describe("local databases", () => {
       ]);
 
       expect(onDidChangeDatabaseItem).toHaveBeenCalledWith({
-        item: undefined,
+        fullRefresh: true,
+        item: mockDbItem,
         kind: DatabaseEventKind.Rename,
       });
     });
@@ -198,7 +201,8 @@ describe("local databases", () => {
       ]);
 
       const mockEvent = {
-        item: undefined,
+        fullRefresh: true,
+        item: mockDbItem,
         kind: DatabaseEventKind.Add,
       };
       expect(onDidChangeDatabaseItem).toHaveBeenCalledWith(mockEvent);