src/vs/base/browser/ui/splitview/splitview.ts/SplitView/onSashEnd
class SplitView:	private onSashEnd(index: number): void {
		this._onDidSashChange.fire(index);
		this.sashDragState!.disposable.dispose();
		this.saveProportions();

		for (const item of this.viewItems) {
			item.enabled = true;
		}
	}