Make backtrace collapsible

[eznix86]

Amazing tool!

As always, just saw some need on my side, so the issue is that if I do a

xr($var, f: XR_BACKTRACE);

You end up with a long backtrace which is hard to debug if you have placed many of them.

[rodber]

I think that a collapsible backtrace will be troublesome for users as for every item (or items) will require a click action to show more. This is counter intuitive as what you care about the trace depends on your context, sometimes you will require to browse the entire thing, sometimes you will need to focus in just a few items.

I think that a scrollable viewport backtrace will fit better and it is also very trivial to implement, it just requires a container and max height.

[eznix86]

Thanks for replying! I will try to dig a little bit what's size the container could be and be revert back to you! Just to chip in a little bit 😅

[rodber]

According to the spec, browsers should support to resize a DIV so we could have a scroll thing with resizable height for better display on each case.

https://www.w3.org/TR/css-ui-3/#resize

[rodber]

Added in 2.0.1