Silent scan for kits to avoid breaking changes in kits definition

src/extension.ts

@@ -20,6 +20,7 @@ import {
   USER_KITS_FILEPATH,
   findCLCompilerPath,
   effectiveKitEnvironment,
+  scanForKitsIfNeeded,
 } from '@cmt/kit';
 import {KitsController} from '@cmt/kitsController';
 import * as logging from '@cmt/logging';
@@ -1106,6 +1107,9 @@ export async function activate(context: vscode.ExtensionContext) {
         await vscode.window.showWarningMessage(localize('uninstall.old.cmaketools', 'Please uninstall any older versions of the CMake Tools extension. It is now published by Microsoft starting with version 1.2.0.'));
     }
 
+    // Silent re-scan when detecting a breaking change in the kits definition.
+    await scanForKitsIfNeeded(context);
+
   // Register a protocol handler to serve localized schemas
   vscode.workspace.registerTextDocumentContentProvider('cmake-tools-schema', new SchemaProvider());
   vscode.commands.executeCommand("setContext", "inCMakeProject", true);

src/kit.ts

@@ -973,6 +973,18 @@ export async function scanForKits(opt?: KitScanOptions) {
   });
 }
 
+// Rescan if the kits versions (extension context state var versus value defined for this release) don't match.
+export async function scanForKitsIfNeeded(context: vscode.ExtensionContext) : Promise<void> {
+  const kitsVersionSaved = context.workspaceState.get<number>('kitsVersionSaved');
+  const kitsVersionCurrent = 1;
+
+  // Scan also when there is no kits version saved in the state.
+  if (!kitsVersionSaved || kitsVersionSaved !== kitsVersionCurrent) {
+    await scanForKits();
+    context.workspaceState.update('kitsVersionSaved', kitsVersionCurrent);
+  }
+}
+
 /**
  * Generates a string description of a kit. This is shown to the user.
  * @param kit The kit to generate a description for