Handle resize message in Agent dashboard tab (#1908)

* Resize related changes WIP

* Resize table control better on resize

* Update DashboardTab to use inherited Disposable

* Set forceFitColumns to false

src/sql/parts/dashboard/common/interfaces.ts

@@ -32,22 +32,10 @@ export abstract class DashboardTab extends TabChild implements OnDestroy {
 	public enableEdit(): void {
 		// no op
 	}
-
-	private _toDispose: IDisposable[] = [];
-
 	constructor() {
 		super();
 	}
 
-	public dispose(): void {
-		this._toDispose = dispose(this._toDispose);
-	}
-
-	protected _register<T extends IDisposable>(t: T): T {
-		this._toDispose.push(t);
-		return t;
-	}
-
 	ngOnDestroy() {
 		this.dispose();
 	}

src/sql/parts/dashboard/dashboardEditor.ts

@@ -71,6 +71,7 @@ export class DashboardEditor extends BaseEditor {
 	 * To be called when the container of this editor changes size.
 	 */
 	public layout(dimension: DOM.Dimension): void {
+		this._dashboardService.layout(dimension);
 	}
 
 	public setInput(input: DashboardInput, options: EditorOptions): TPromise<void> {