Limiting the valid x,y range of HoverToolTip

[Peppershaker]

First, thank you for this amazing package. Beautifully written code.

I'm trying to add SvgPathAnnotations with tooltip to a candlestick chart that could give the user additional information via the tooltip when hovering over or clicking the SvgPathAnnotation.

I have tried adding a HoverTooltip to the chart, but there are 2 issues.

1. The HoverTooltip updates every time the mouse moves. It would be nice if the tooltip is static.
2. The HoverTooltip is disabled when hovering over the SvgPathAnnotation, and is enabled everywhere else.

Any pointers appreciated. Thanks again!