Handle query directory not existing

Also, fix some changelog notes.

extensions/ql-vscode/CHANGELOG.md

@@ -3,8 +3,8 @@
 ## [UNRELEASED]
 
 - Fix a bug where the AST viewer was not synchronizing its selected node when the editor selection changes. [#1230](https://github.com/github/vscode-codeql/pull/1230)
-- Open the directory in the finder/explorer (instead of just highlighting it) when running the command "Open query directory" command from the query history view. [#1235](https://github.com/github/vscode-codeql/pull/1235)
-- Ensure query label changes are persisted across restarts. [#1235](https://github.com/github/vscode-codeql/pull/1235)
+- Open the directory in the finder/explorer (instead of just highlighting it) when running the "Open query directory" command from the query history view. [#1235](https://github.com/github/vscode-codeql/pull/1235)
+- Ensure query label in the query history view changes are persisted across restarts. [#1235](https://github.com/github/vscode-codeql/pull/1235)
 
 ## 1.6.1 - 17 March 2022
 

extensions/ql-vscode/src/query-history.ts

@@ -1,4 +1,5 @@
 import * as path from 'path';
+import * as fs from 'fs-extra';
 import {
   commands,
   Disposable,
@@ -747,6 +748,14 @@ export class QueryHistoryManager extends DisposableObject {
     }
 
     if (externalFilePath) {
+      if (!(await fs.pathExists(externalFilePath))) {
+        // timestamp file is missing (manually deleted?) try selecting the parent folder.
+        // It's less nice, but at least it will work.
+        externalFilePath = path.dirname(externalFilePath);
+        if (!(await fs.pathExists(externalFilePath))) {
+          throw new Error(`Query directory does not exist: ${externalFilePath}`);
+        }
+      }
       try {
         await commands.executeCommand('revealFileInOS', Uri.file(externalFilePath));
       } catch (e) {