Fix #62861

src/vs/workbench/browser/parts/activitybar/activitybarPart.ts

@@ -30,12 +30,18 @@ import { IExtensionService } from 'vs/workbench/services/extensions/common/exten
 import { URI } from 'vs/base/common/uri';
 import { ToggleCompositePinnedAction, ICompositeBarColors } from 'vs/workbench/browser/parts/compositeBarActions';
 import { ViewletDescriptor } from 'vs/workbench/browser/viewlet';
+import { IViewsService, IViewContainersRegistry, Extensions as ViewContainerExtensions } from 'vs/workbench/common/views';
+import { IContextKeyService, ContextKeyExpr } from 'vs/platform/contextkey/common/contextkey';
 
 interface IPlaceholderComposite {
 	id: string;
 	iconUrl: URI;
 }
 
+interface ISerializedPlaceholderComposite extends IPlaceholderComposite {
+	whens?: string[];
+}
+
 export class ActivitybarPart extends Part {
 
 	private static readonly ACTION_HEIGHT = 50;
@@ -59,7 +65,9 @@ export class ActivitybarPart extends Part {
 		@IThemeService themeService: IThemeService,
 		@ILifecycleService private lifecycleService: ILifecycleService,
 		@IStorageService private storageService: IStorageService,
-		@IExtensionService private extensionService: IExtensionService
+		@IExtensionService private extensionService: IExtensionService,
+		@IViewsService private viewsService: IViewsService,
+		@IContextKeyService contextKeyService: IContextKeyService
 	) {
 		super(id, { hasTitle: false }, themeService, storageService);
 
@@ -80,14 +88,20 @@ export class ActivitybarPart extends Part {
 		}));
 
 		const previousState = this.storageService.get(ActivitybarPart.PLACEHOLDER_VIEWLETS, StorageScope.GLOBAL, '[]');
-		this.placeholderComposites = <IPlaceholderComposite[]>JSON.parse(previousState);
-		this.placeholderComposites.forEach((s) => {
-			if (typeof s.iconUrl === 'object') {
-				s.iconUrl = URI.revive(s.iconUrl);
-			} else {
-				s.iconUrl = void 0;
-			}
+		const serializedPlaceholderComposites = <ISerializedPlaceholderComposite[]>JSON.parse(previousState);
+		this.placeholderComposites = [];
+		for (const { id, iconUrl, whens } of serializedPlaceholderComposites) {
+			if (whens && whens.length > 0) {
+				if (whens.every(when => !contextKeyService.contextMatchesRules(ContextKeyExpr.deserialize(when)))) {
+					// Hidden by default
+					continue;
+				}
+			}
+			this.placeholderComposites.push({
+				id,
+				iconUrl: typeof iconUrl === 'object' ? URI.revive(iconUrl) : void 0
 			});
+		}
 
 		this.registerListeners();
 		this.updateCompositebar();
@@ -332,7 +346,22 @@ export class ActivitybarPart extends Part {
 	}
 
 	protected saveState(): void {
-		const state = this.viewletService.getAllViewlets().map(({ id, iconUrl }) => ({ id, iconUrl }));
+		const viewContainerRegistry = Registry.as<IViewContainersRegistry>(ViewContainerExtensions.ViewContainersRegistry);
+		const state: ISerializedPlaceholderComposite[] = [];
+		for (const { id, iconUrl } of this.viewletService.getAllViewlets()) {
+			if (iconUrl) {
+				const viewContainer = viewContainerRegistry.get(id);
+				const whens: string[] = [];
+				if (viewContainer) {
+					for (const { when } of this.viewsService.getViewDescriptors(viewContainer).allViewDescriptors) {
+						if (when) {
+							whens.push(when.serialize());
+						}
+					}
+				}
+				state.push({ id, iconUrl, whens });
+			}
+		}
 		this.storageService.store(ActivitybarPart.PLACEHOLDER_VIEWLETS, JSON.stringify(state), StorageScope.GLOBAL);
 
 		super.saveState();

src/vs/workbench/browser/parts/views/views.ts

@@ -80,6 +80,10 @@ class ViewDescriptorCollection extends Disposable implements IViewDescriptorColl
 			.map(i => i.viewDescriptor);
 	}
 
+	get allViewDescriptors(): IViewDescriptor[] {
+		return this.items.map(i => i.viewDescriptor);
+	}
+
 	constructor(
 		container: ViewContainer,
 		@IContextKeyService private contextKeyService: IContextKeyService

src/vs/workbench/common/views.ts

@@ -119,6 +119,7 @@ export interface IViewDescriptor {
 export interface IViewDescriptorCollection {
 	readonly onDidChangeActiveViews: Event<{ added: IViewDescriptor[], removed: IViewDescriptor[] }>;
 	readonly activeViewDescriptors: IViewDescriptor[];
+	readonly allViewDescriptors: IViewDescriptor[];
 }
 
 export interface IViewsRegistry {