Fix leak in comments widget (microsoft#166016)

Fixes microsoft#165986

Author: alexr00

src/vs/workbench/contrib/comments/browser/commentNode.ts

@@ -494,6 +494,7 @@ export class CommentNode<T extends IRange | ICellRange> extends Disposable {
 			this.removeCommentEditor();
 		}, this.themeService);
 
+		this._register(this._commentFormActions);
 		this._commentFormActions.setActions(menu);
 	}
 

src/vs/workbench/contrib/comments/browser/commentReply.ts

@@ -261,6 +261,7 @@ export class CommentReply<T extends IRange | ICellRange> extends Disposable {
 			this.hideReplyArea();
 		}, this.themeService);
 
+		this._register(this._commentFormActions);
 		this._commentFormActions.setActions(menu);
 	}
 

src/vs/workbench/contrib/comments/browser/commentThreadWidget.ts

@@ -98,6 +98,7 @@ export class CommentThreadWidget<T extends IRange | ICellRange = IRange> extends
 			this._scopedInstatiationService,
 			this
 		) as unknown as CommentThreadBody<T>;
+		this._register(this._body);
 
 		this._styleElement = dom.createStyleSheet(this.container);