grid: views should know which orientation they are laid out

src/vs/base/browser/ui/centered/centeredViewLayout.ts

@@ -40,7 +40,7 @@ function toSplitViewView(view: IView, getHeight: () => number): ISplitViewView {
 		get maximumSize() { return view.maximumWidth; },
 		get minimumSize() { return view.minimumWidth; },
 		onDidChange: Event.map(view.onDidChange, e => e && e.width),
-		layout: size => view.layout(size, getHeight())
+		layout: size => view.layout(size, getHeight(), Orientation.HORIZONTAL)
 	};
 }
 
@@ -78,7 +78,7 @@ export class CenteredViewLayout {
 				this.resizeMargins();
 			}
 		} else {
-			this.view.layout(width, height);
+			this.view.layout(width, height, Orientation.HORIZONTAL);
 		}
 		this.didLayout = true;
 	}

src/vs/base/browser/ui/grid/gridview.ts

@@ -24,7 +24,7 @@ export interface IView {
 	readonly onDidChange: Event<{ width: number; height: number; } | undefined>;
 	readonly priority?: LayoutPriority;
 	readonly snapSize?: number;
-	layout(width: number, height: number): void;
+	layout(width: number, height: number, orientation: Orientation): void;
 }
 
 export function orthogonal(orientation: Orientation): Orientation {
@@ -480,12 +480,12 @@ class LeafNode implements ISplitView, IDisposable {
 
 	layout(size: number): void {
 		this._size = size;
-		return this.view.layout(this.width, this.height);
+		return this.view.layout(this.width, this.height, orthogonal(this.orientation));
 	}
 
 	orthogonalLayout(size: number): void {
 		this._orthogonalSize = size;
-		return this.view.layout(this.width, this.height);
+		return this.view.layout(this.width, this.height, orthogonal(this.orientation));
 	}
 
 	dispose(): void { }