Layout dimension left/right after renderer dims change

Fixes #3773

src/browser/TestUtils.test.ts

@@ -396,7 +396,7 @@ export class MockRenderService implements IRenderService {
   public resize(cols: number, rows: number): void {
     throw new Error('Method not implemented.');
   }
-  public changeOptions(): void {
+  public _handleOptionsChanged(): void {
     throw new Error('Method not implemented.');
   }
   public setRenderer(renderer: IRenderer): void {