src/vs/workbench/contrib/terminal/browser/terminalGroup.ts/SplitPane/layout
class SplitPane:	layout(size: number): void {
		// Only layout when both sizes are known
		if (!size || !this.orthogonalSize) {
			return;
		}

		if (this.orientation === Orientation.VERTICAL) {
			this.instance.layout({ width: this.orthogonalSize, height: size });
		} else {
			this.instance.layout({ width: size, height: this.orthogonalSize });
		}
	}