grid - change getViewSize to just return one dimension

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

@@ -187,9 +187,11 @@ export class Grid<T extends IView> implements IDisposable {
 		return this.gridview.resizeView(location, size);
 	}
 
-	getViewSize(view: T): { width: number; height: number; } {
+	getViewSize(view: T): number {
 		const location = this.getViewLocation(view);
-		return this.gridview.getViewSize(location);
+		const viewSize = this.gridview.getViewSize(location);
+
+		return getLocationOrientation(this.orientation, location) === Orientation.HORIZONTAL ? viewSize.width : viewSize.height;
 	}
 
 	getViews(): GridBranchNode<T> {

src/vs/workbench/browser/parts/editor2/nextEditorPart.ts

@@ -196,11 +196,9 @@ export class NextEditorPart extends Part implements INextEditorGroupsService, IN
 
 	resizeGroup(group: INextEditorGroupView | GroupIdentifier, sizeDelta: number): INextEditorGroupView {
 		const groupView = this.assertGroupView(group);
-
 		const currentSize = this.gridWidget.getViewSize(groupView);
-		const currentOrientation = this.gridWidget.getOrientation(groupView);
 
-		this.gridWidget.resizeView(groupView, currentOrientation === Orientation.HORIZONTAL ? currentSize.width + sizeDelta : currentSize.height + sizeDelta);
+		this.gridWidget.resizeView(groupView, currentSize + sizeDelta);
 
 		return groupView;
 	}