src/vs/base/browser/ui/splitview/splitview.ts/SplitView/isViewSizeMaximized
class SplitView:	isViewSizeMaximized(index: number): boolean {
		if (index < 0 || index >= this.viewItems.length) {
			return false;
		}

		for (const item of this.viewItems) {
			if (item !== this.viewItems[index] && item.size > item.minimumSize) {
				return false;
			}
		}

		return true;
	}