Fix extension not switching to preset mode after Quick Start generates CMakePresets.json (#4712)

* Initial plan

* Fix extension not switching to preset mode after Quick Start generates CMakePresets.json

Subscribe to onUseCMakePresetsChanged in ProjectController.setupProjectSubscriptions()
so that when doUseCMakePresetsChange() detects a new CMakePresets.json (e.g. after
Quick Start), the VS Code context, status bar, and project status are updated to
reflect preset mode.

Fixes #4569

Co-authored-by: hanniavalera <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: hanniavalera <[email protected]>

Author: Copilot

CHANGELOG.md

@@ -10,6 +10,7 @@ Improvements:
 - Add MSVC linker error problem matching to the Problems pane. [#4675](https://github.com/microsoft/vscode-cmake-tools/pull/4675) [@bradphelan](https://github.com/bradphelan)
 
 Bug Fixes:
+- Fix extension not switching to preset mode after "CMake: Quick Start" generates a CMakePresets.json, causing variant selection to have no effect. [#4569](https://github.com/microsoft/vscode-cmake-tools/issues/4569)
 - Fix spurious preset reloads triggered by unrelated file system events such as builds, git commits, and `cmake.copyCompileCommands`. Migrated file watching from chokidar to VS Code's built-in `FileSystemWatcher` API, which also resolves high CPU usage on Apple M1. [#4703](https://github.com/microsoft/vscode-cmake-tools/issues/4703) [#2967](https://github.com/microsoft/vscode-cmake-tools/issues/2967)
 - Clarify that semicolons in `cmake.configureSettings` string values are escaped, and array notation should be used for CMake lists. [#4585](https://github.com/microsoft/vscode-cmake-tools/issues/4585)
 - Fix "CMake: Quick Start" command failing silently when no folder is open. Now shows an error message with an option to open a folder. [#4504](https://github.com/microsoft/vscode-cmake-tools/issues/4504)

src/projectController.ts

@@ -60,6 +60,7 @@ export class ProjectController implements vscode.Disposable {
     private activePackagePresetSub: vscode.Disposable = new DummyDisposable();
     private activeWorkflowPresetSub: vscode.Disposable = new DummyDisposable();
     private isBusySub = new DummyDisposable();
+    private useCMakePresetsChangedSub: vscode.Disposable = new DummyDisposable();
     private projectSubscriptions: vscode.Disposable[] = [
         this.targetNameSub,
         this.variantNameSub,
@@ -70,7 +71,8 @@ export class ProjectController implements vscode.Disposable {
         this.activeTestPresetSub,
         this.activePackagePresetSub,
         this.activeWorkflowPresetSub,
-        this.isBusySub
+        this.isBusySub,
+        this.useCMakePresetsChangedSub
     ];
 
     get onBeforeAcknowledgeFolder() {
@@ -148,6 +150,7 @@ export class ProjectController implements vscode.Disposable {
             this.activePackagePresetSub = new DummyDisposable();
             this.activeWorkflowPresetSub = new DummyDisposable();
             this.isBusySub = new DummyDisposable();
+            this.useCMakePresetsChangedSub = new DummyDisposable();
         } else {
             this.targetNameSub = project.onTargetNameChanged(FireNow, () => void this.projectStatus.refresh());
             this.variantNameSub = project.onActiveVariantNameChanged(FireNow, () => void this.projectStatus.refresh());
@@ -159,6 +162,7 @@ export class ProjectController implements vscode.Disposable {
             this.activePackagePresetSub = project.onActivePackagePresetChanged(FireNow, () => void this.projectStatus.refresh());
             this.activeWorkflowPresetSub = project.onActiveWorkflowPresetChanged(FireNow, () => void this.projectStatus.refresh());
             this.isBusySub = project.onIsBusyChanged(FireNow, (isBusy) => void this.projectStatus.setIsBusy(isBusy));
+            this.useCMakePresetsChangedSub = project.onUseCMakePresetsChanged(() => void this.updateUsePresetsState(project));
             await setContextAndStore(ext.hideBuildCommandKey, project.hideBuildButton);
             await setContextAndStore(ext.hideDebugCommandKey, project.hideDebugButton);
             await setContextAndStore(ext.hideLaunchCommandKey, project.hideLaunchButton);