src/vs/workbench/browser/parts/panel/panelPart.ts/PanelPart/onDidPanelOpen
class PanelPart:	get onDidPanelOpen(): Event<{ panel: IPanel, focus: boolean; }> { return Event.map(this.onDidCompositeOpen.event, compositeOpen => ({ panel: compositeOpen.composite, focus: compositeOpen.focus })); }