bug#32850: 27.0.50; window-swap-states doesn't swap window prev/next-buffers

[martin rudalics]

> Since now finally we have persistence for window configurations,
> I'm going to revive the x-tabs branch.  The package wincows.el
> was needed for testing what will be the internal functionality
> in the x-tabs branch.  And for the user interface it could use
> what you implemented for displaying tabs in side windows in frame-tabs.el.
> Would you allow using your code from frame-tabs.el in the x-tabs branch?

Sure.  IIRC you used a menubar-like window to implement a tab-bar back
then.  Does the "x" stand for X-only?  Would this limit us to X-based
builds?

martin