src/vs/workbench/browser/layout.ts/Layout/getLayoutClasses
class Layout:	getLayoutClasses(): string[] {
		return coalesce([
			!this.isVisible(Parts.SIDEBAR_PART) ? LayoutClasses.SIDEBAR_HIDDEN : undefined,
			!this.isVisible(Parts.EDITOR_PART) ? LayoutClasses.EDITOR_HIDDEN : undefined,
			!this.isVisible(Parts.PANEL_PART) ? LayoutClasses.PANEL_HIDDEN : undefined,
			!this.isVisible(Parts.AUXILIARYBAR_PART) ? LayoutClasses.AUXILIARYBAR_HIDDEN : undefined,
			!this.isVisible(Parts.STATUSBAR_PART) ? LayoutClasses.STATUSBAR_HIDDEN : undefined,
			this.state.runtime.fullscreen ? LayoutClasses.FULLSCREEN : undefined
		]);
	}