Re Microsoft/vscode-pull-request-github#135. Do not dipose newCommentWidget when collapsed.

src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts

@@ -582,7 +582,9 @@ export class ReviewZoneWidget extends ZoneWidget {
 				this.show({ lineNumber: lineNumber, column: 1 }, 2);
 			} else {
 				this.hide();
-				this._onDidClose.fire();
+				if (this._commentThread === null) {
+					this.dispose();
+				}
 			}
 		}
 	}

src/vs/workbench/parts/comments/electron-browser/commentsEditorContribution.ts

@@ -396,7 +396,6 @@ export class ReviewController implements IEditorContribution {
 		}, {});
 
 		this._newCommentWidget.onDidClose(e => {
-			this._newCommentWidget.dispose();
 			this._newCommentWidget = null;
 		});
 		this._newCommentWidget.display(lineNumber, this._commentingRangeDecorator.commentsOptions);