Agents web: fix layout resize (#318478)

Author: osortega

src/vs/sessions/browser/parts/mobile/mobileSessionsPart.ts

@@ -51,7 +51,8 @@ export class MobileSessionsPart extends SessionsPart {
 		this._lastLayout = { width, height, top, left };
 
 		// Full dimensions - no card margins or session-bar subtraction.
-		this.layoutContents(width, height);
+		const { contentSize } = this.layoutContents(width, height);
+		this._gridWidget?.layout(contentSize.width, contentSize.height, top, left);
 		Part.prototype.layout.call(this, width, height, top, left);
 	}
 }

src/vs/sessions/browser/parts/sessionsPart.ts

@@ -54,7 +54,7 @@ export class SessionsPart extends Part {
 	static readonly BORDER_WIDTH = 1;
 
 	/** Internal grid that hosts the part's session views. */
-	private _gridWidget: SerializableGrid<SessionView> | undefined;
+	protected _gridWidget: SerializableGrid<SessionView> | undefined;
 
 	/** Lazily-created progress bar shown at the top of the content area. */
 	private _progressBar: ProgressBar | undefined;