src/vs/workbench/browser/parts/compositePart.ts/CompositePart/layout
class CompositePart:	override layout(width: number, height: number, top: number, left: number): void {
		super.layout(width, height, top, left);

		// Layout contents
		this.contentAreaSize = Dimension.lift(super.layoutContents(width, height).contentSize);

		// Layout composite
		if (this.activeComposite) {
			this.activeComposite.layout(this.contentAreaSize);
		}
	}