src/vs/workbench/contrib/comments/browser/commentService.ts/CommentService/_handleZenMode
class CommentService:	private _handleZenMode() {
		let preZenModeValue: boolean = this._isCommentingEnabled;
		this._register(this.layoutService.onDidChangeZenMode(e => {
			if (e) {
				preZenModeValue = this._isCommentingEnabled;
				this.enableCommenting(false);
			} else {
				this.enableCommenting(preZenModeValue);
			}
		}));
	}