src/vs/workbench/contrib/preferences/browser/preferencesWidgets.ts/EditPreferenceWidget/constructor
class EditPreferenceWidget:	constructor(private editor: ICodeEditor) {
		super();
		this._editPreferenceDecoration = [];
		this._register(this.editor.onMouseDown((e: IEditorMouseEvent) => {
			if (e.target.type !== MouseTargetType.GUTTER_GLYPH_MARGIN || e.target.detail.isAfterLines || !this.isVisible()) {
				return;
			}
			this._onClick.fire(e);
		}));
	}