scatterChart explorer options: zoom rectangle stays highlighted after zoom happens

[E]

Hello,

I use a scatter chart with the explorer options to be able to zoom in.

(note this is in Angular wrapped with the ng-google-chart module https://github.com/angular-google-chart/angular-google-chart)

When zooming in, the zooming area is defined by a highlighted rectangle from the mouse drag/mouse up.

The zoom happens (i.e. the scale changes) but the rectangle stays highlighted at the original position on the chart (i.e. NOT around the zoomed area, but around the position that was zoomed from)

Is this rectangle supposed to disappear after releasing the mouse?

If so, what should I look for to make that happen?

Also, it seems like the drag area is limited by the view (which makes sense but makes it very hard to zoom on edges of the plot, as starting to drag outside the window just selects and grabs whatever is around the chart. is there ay way to expands the drag window around the edges? (padding?)

Thanks for your help.