Fix Microsoft/vscode-pull-request-github#182. Remove all decorations when...

Fix Microsoft/vscode-pull-request-github#182. Remove all decorations when there is no comment avail.

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

@@ -64,6 +64,10 @@ export const overviewRulerCommentingRangeForeground = registerColor('editorGutte
 class CommentingRangeDecoration {
 	private _decorationId: string;
 
+	get id(): string {
+		return this._decorationId;
+	}
+
 	constructor(private _editor: ICodeEditor, private _ownerId: number, private _range: IRange, private _reply: modes.Command, commentingOptions: ModelDecorationOptions) {
 		const startLineNumber = _range.startLineNumber;
 		const endLineNumber = _range.endLineNumber;
@@ -133,6 +137,9 @@ class CommentingRangeDecorator {
 			});
 		}
 
+		let oldDecorations = this.commentingRangeDecorations.map(decoration => decoration.id);
+		editor.deltaDecorations(oldDecorations, []);
+
 		this.commentingRangeDecorations = commentingRangeDecorations;
 	}
 
@@ -496,6 +503,8 @@ export class ReviewController implements IEditorContribution {
 			zone.dispose();
 		});
 
+		this._commentWidgets = [];
+
 		this._commentInfos.forEach(info => {
 			info.threads.forEach(thread => {
 				let zoneWidget = new ReviewZoneWidget(this.instantiationService, this.modeService, this.modelService, this.themeService, this.commentService, this.openerService, this.editor, info.owner, thread, {});