fixes microsoft#134679

Author: sbatten

src/vs/workbench/browser/layout.ts

@@ -1308,6 +1308,12 @@ export abstract class Layout extends Disposable implements IWorkbenchLayoutServi
 
 			this.storageService.store(Storage.SIDEBAR_SIZE, sideBarSize, StorageScope.GLOBAL, StorageTarget.MACHINE);
 
+			const auxiliaryBarSize = this.state.auxiliaryBar.hidden
+				? grid.getViewCachedVisibleSize(this.auxiliaryBarPartView)
+				: grid.getViewSize(this.auxiliaryBarPartView).width;
+
+			this.storageService.store(Storage.AUXILIARYBAR_SIZE, auxiliaryBarSize, StorageScope.GLOBAL, StorageTarget.MACHINE);
+
 			const panelSize = this.state.panel.hidden
 				? grid.getViewCachedVisibleSize(this.panelPartView)
 				: (this.state.panel.position === Position.BOTTOM ? grid.getViewSize(this.panelPartView).height : grid.getViewSize(this.panelPartView).width);