src/vs/editor/contrib/zoneWidget/zoneWidget.ts/Arrow/show
class Arrow:	show(where: IPosition): void {
		this._decorations = this._editor.deltaDecorations(
			this._decorations,
			[{ range: Range.fromPositions(where), options: { description: 'zone-widget-arrow', className: this._ruleName, stickiness: TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges } }]
		);
	}