src/vs/editor/contrib/parameterHints/parameterHintsWidget.ts/ParameterHintsWidget/getPosition
class ParameterHintsWidget:	getPosition(): IContentWidgetPosition | null {
		if (this.visible) {
			return {
				position: this.editor.getPosition(),
				preference: [ContentWidgetPositionPreference.ABOVE, ContentWidgetPositionPreference.BELOW]
			};
		}
		return null;
	}