At Thu, 07 Apr 2016 15:05:12 -0400, "'John Clements' via Racket Users" wrote:
> > On Apr 7, 2016, at 8:34 AM, Matthew Flatt <mfl...@cs.utah.edu> wrote:
> > It looks like it's not a question of running DrRacket for a while, but
> > of having multiple tabs in DrRacket. And, more specifically, it's not
> > about DrRacket, but about showing a window containing a `tab-panel%`
> > instance that uses the 'no-border style on OS X.

The problem seems to happen only with 64-bit builds on 10.11. I don't
know why, but 10.11 changes the way that windows are drawn in a fairly
deep way, and it's probably something related to that change.

Fortunately, MiMo42 provides MMTabBarView as a replacement for
PSMTabBarControl. It only works on 64-bit 10.9 and up, but that covers
the case where PSMTabBarControl is a problem. Also, MMTabBarView
includes a Yosemite style. So, I've switched `racket/gui` (and
therefore DrRacket) to use MMTabBarView on 64-bit 10.10 and up.

> (You saw that I opened a PR for this? [...])

Yes, I'll close it.

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