src/vs/workbench/browser/layout.ts/Layout/offset
class Layout:	get offset() {
		let top = 0;
		let quickPickTop = 0;
		if (this.isVisible(Parts.BANNER_PART)) {
			top = this.getPart(Parts.BANNER_PART).maximumHeight;
			quickPickTop = top;
		}
		if (this.isVisible(Parts.TITLEBAR_PART)) {
			top += this.getPart(Parts.TITLEBAR_PART).maximumHeight;
			quickPickTop = top;
		}
		// If the command center is visible then the quickinput should go over the title bar and the banner
		if (this.titleService.isCommandCenterVisible) {
			quickPickTop = 0;
		}
		return { top, quickPickTop };
	}