Adjust calendar sizing when scrollbar width changes (or (de)activated)

[eladkas]

Consistently reproducible on Firefox/Chrome on Mac only -
See attached gif - this 'jump' happens when I unplug my mouse (...)
2nd jump, back to normal, happens when I plug it back in again.

[gotjoshua]

There is a workaround via system settings... but it seems so strange.
#5180 (comment)

[acerix]

Sorry for the delay in responding to your issue, I have just began triaging on this repo. Please see this post about the state of the repo (fullcalendar/fullcalendar-react#66) for more info.

I believe this existing ticket captures this need:
#5180
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[arshaw]

I'll actually reopen this issue because it's a bit different that #5180

The solution to this ticket's problem it to essentially call Calendar::updateSize when we know the mouse has been disconnected.

[arshaw]

This is fixed in v7.0.0-beta.0