Fix microsoft#75775

sandy081 · sandy081 · commit 2f0700cee7ee · 2019-06-30T16:31:34.000+02:00
diff --git a/src/vs/workbench/browser/parts/views/viewsViewlet.ts b/src/vs/workbench/browser/parts/views/viewsViewlet.ts
@@ -42,7 +42,7 @@ export abstract class ViewContainerViewlet extends PanelViewlet implements IView
 	private dimension: DOM.Dimension;
 	private areExtensionsReady: boolean = false;
 
-	private readonly visibleViewsCountFromCache: number;
+	private readonly visibleViewsCountFromCache: number | undefined;
 	private readonly visibleViewsStorageId: string;
 	protected readonly viewsModel: PersistentContributableViewsModel;
 	private viewDisposables: IDisposable[] = [];
@@ -68,7 +68,7 @@ export abstract class ViewContainerViewlet extends PanelViewlet implements IView
 		this.viewletState = this.getMemento(StorageScope.WORKSPACE);
 
 		this.visibleViewsStorageId = `${id}.numberOfVisibleViews`;
-		this.visibleViewsCountFromCache = this.storageService.getNumber(this.visibleViewsStorageId, StorageScope.WORKSPACE, 1);
+		this.visibleViewsCountFromCache = this.storageService.getNumber(this.visibleViewsStorageId, StorageScope.WORKSPACE, undefined);
 		this._register(toDisposable(() => this.viewDisposables = dispose(this.viewDisposables)));
 	}
 
@@ -172,6 +172,9 @@ export abstract class ViewContainerViewlet extends PanelViewlet implements IView
 			return false;
 		}
 		if (!this.areExtensionsReady) {
+			if (this.visibleViewsCountFromCache === undefined) {
+				return false;
+			}
 			// Check in cache so that view do not jump. See #29609
 			return this.visibleViewsCountFromCache === 1;
 		}
