src/vs/workbench/contrib/comments/browser/commentsEditorContribution.ts/CommentController/getExistingCommentEditorOptions
class CommentController:	private getExistingCommentEditorOptions(editor: ICodeEditor) {
		const lineDecorationsWidth: number = editor.getOption(EditorOption.lineDecorationsWidth);
		let extraEditorClassName: string[] = [];
		const configuredExtraClassName = editor.getRawOptions().extraEditorClassName;
		if (configuredExtraClassName) {
			extraEditorClassName = configuredExtraClassName.split(' ');
		}
		return { lineDecorationsWidth, extraEditorClassName };
	}