zooming behavior scaling open items

[alexcjohnson]

#761 got some of our plot elements to scale correctly during a dynamic zoom, and #1897 extends this a bit further, but there are still a few items that stretch in this process and then jump to the new size later:

• errorbar caps: their stroke is correct, but their lengths are not. Presumably what's needed is a 1D version of Drawing.setPointScale (or just calling it with one of the dimensions set to 1) - see better zooming behavior for errorbars, bars, and box plots #1897 (comment)
• contour labels - this is a bit tricky, see better zooming behavior for errorbars, bars, and box plots #1897 (comment) - but we could do something anyway. Perhaps we scale them down but not up?
• bar text - see better zooming behavior for errorbars, bars, and box plots #1897 (comment)

[etpinard]

cc #2625

when implementing items in the checklist, please have performance in mind, zoom scale can be very costly.

[gvwilson]

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson