src/vs/editor/contrib/zoneWidget/browser/zoneWidget.ts/Arrow/show
class Arrow:	show(where: IPosition): void {

		if (where.column === 1) {
			// the arrow isn't pretty at column 1 and we need to push it out a little
			where = { lineNumber: where.lineNumber, column: 2 };
		}

		this._decorations = this._editor.deltaDecorations(
			this._decorations,
			[{ range: Range.fromPositions(where), options: { description: 'zone-widget-arrow', className: this._ruleName, stickiness: TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges } }]
		);
	}