src/vs/base/browser/ui/splitview/paneview.ts/PaneView/layout
class PaneView:	layout(height: number, width: number): void {
		this.orthogonalSize = this.orientation === Orientation.VERTICAL ? width : height;
		this.size = this.orientation === Orientation.HORIZONTAL ? width : height;

		for (const paneItem of this.paneItems) {
			paneItem.pane.orthogonalSize = this.orthogonalSize;
		}

		this.splitview.layout(this.size);
	}