Fix issues with dynamic updating of the version status bar item

1. Wait a few seconds before updating the status bar after a version
   change.
2. Ensure we are watching the correct configuration items for changes.
3. Ensure the cli version is refreshed correctly.

Author: aeisenberg

extensions/ql-vscode/src/cli.ts

@@ -162,6 +162,7 @@ export class CodeQLCliServer implements Disposable {
     if (this.distributionProvider.onDidChangeDistribution) {
       this.distributionProvider.onDidChangeDistribution(() => {
         this.restartCliServer();
+        this._version = undefined;
       });
     }
     if (this.cliConfig.onDidChangeConfiguration) {

extensions/ql-vscode/src/config.ts

@@ -50,7 +50,7 @@ export const GLOBAL_ENABLE_TELEMETRY = new Setting('enableTelemetry', GLOBAL_TEL
 
 // Distribution configuration
 const DISTRIBUTION_SETTING = new Setting('cli', ROOT_SETTING);
-const CUSTOM_CODEQL_PATH_SETTING = new Setting('executablePath', DISTRIBUTION_SETTING);
+export const CUSTOM_CODEQL_PATH_SETTING = new Setting('executablePath', DISTRIBUTION_SETTING);
 const INCLUDE_PRERELEASE_SETTING = new Setting('includePrerelease', DISTRIBUTION_SETTING);
 const PERSONAL_ACCESS_TOKEN_SETTING = new Setting('personalAccessToken', DISTRIBUTION_SETTING);
 const QUERY_HISTORY_SETTING = new Setting('queryHistory', ROOT_SETTING);

extensions/ql-vscode/src/status-bar.ts

@@ -1,6 +1,6 @@
 import { ConfigurationChangeEvent, StatusBarAlignment, StatusBarItem, window, workspace } from 'vscode';
 import { CodeQLCliServer } from './cli';
-import { CANARY_FEATURES, DistributionConfigListener } from './config';
+import { CANARY_FEATURES, CUSTOM_CODEQL_PATH_SETTING, DistributionConfigListener } from './config';
 import { DisposableObject } from './pure/disposable-object';
 
 /**
@@ -24,8 +24,14 @@ export class CodeQlStatusBarHandler extends DisposableObject {
   }
 
   private handleDidChangeConfiguration(e: ConfigurationChangeEvent) {
-    if (e.affectsConfiguration(CANARY_FEATURES.qualifiedName)) {
-      this.updateStatusItem();
+    if (
+      e.affectsConfiguration(CANARY_FEATURES.qualifiedName) ||
+      e.affectsConfiguration(CUSTOM_CODEQL_PATH_SETTING.qualifiedName)
+    ) {
+      // Wait a few seconds before updating the status item.
+      // This avoids a race condition where the cli's version
+      // is not updated before the status bar is refreshed.
+      setTimeout(() => this.updateStatusItem(), 3000);
     }
   }