panel: open default panel when no other panel stored

src/vs/workbench/browser/panel.ts

@@ -57,3 +57,5 @@ export class PanelRegistry extends CompositeRegistry<Panel> {
 export const Extensions = {
 	Panels: 'workbench.contributions.panels'
 };
+
+Registry.add(Extensions.Panels, new PanelRegistry());

src/vs/workbench/browser/parts/panel/panelPart.ts

@@ -150,6 +150,5 @@ export class TogglePanelAction extends Action {
 	}
 }
 
-Registry.add(PanelExtensions.Panels, new PanelRegistry());
 let actionRegistry = <IWorkbenchActionRegistry>Registry.as(WorkbenchExtensions.WorkbenchActions);
 actionRegistry.registerWorkbenchAction(new SyncActionDescriptor(TogglePanelAction, TogglePanelAction.ID, TogglePanelAction.LABEL, { primary: KeyMod.CtrlCmd | KeyCode.KEY_L }), nls.localize('view', "View"));

src/vs/workbench/browser/workbench.ts

@@ -203,10 +203,10 @@ export class Workbench implements IPartService {
 			let compositeAndEditorPromises: Promise[] = [];
 
 			// Show default viewlet unless sidebar is hidden or we dont have a default viewlet
-			let registry = (<ViewletRegistry>Registry.as(ViewletExtensions.Viewlets));
-			let viewletId = registry.getDefaultViewletId();
+			let viewletRegistry = (<ViewletRegistry>Registry.as(ViewletExtensions.Viewlets));
+			let viewletId = viewletRegistry.getDefaultViewletId();
 			if (!this.workbenchParams.configuration.env.isBuilt) {
-				viewletId = this.storageService.get(SidebarPart.activeViewletSettingsKey, StorageScope.WORKSPACE, registry.getDefaultViewletId()); // help developers and restore last view
+				viewletId = this.storageService.get(SidebarPart.activeViewletSettingsKey, StorageScope.WORKSPACE, viewletRegistry.getDefaultViewletId()); // help developers and restore last view
 			}
 
 			if (!this.sideBarHidden && !!viewletId) {
@@ -214,8 +214,9 @@ export class Workbench implements IPartService {
 				compositeAndEditorPromises.push(this.sidebarPart.openViewlet(viewletId, false).then(() => viewletTimerEvent.stop()));
 			}
 
-			if (!this.panelHidden) {
-				const panelId = this.storageService.get(PanelPart.activePanelSettingsKey, StorageScope.WORKSPACE);
+			let panelRegistry = (<PanelRegistry>Registry.as(PanelExtensions.Panels));
+			const panelId = this.storageService.get(PanelPart.activePanelSettingsKey, StorageScope.WORKSPACE, panelRegistry.getDefaultPanelId());
+			if (!this.panelHidden && !!panelId) {
 				compositeAndEditorPromises.push(this.panelPart.openPanel(panelId, false));
 			}