bug#69993: Wrap window buffers while cycling

[martin rudalics via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

 > Often users complain there is no way to wrap window buffers
 > while cycling them with 'C-x C-<left>' (previous-buffer)
 > and 'C-x C-<right>' (next-buffer).  One of the latest examples is
 > https://old.reddit.com/r/emacs/comments/1barvo2/perwindow_buffer_ordering/
 >
 > This problem becomes apparent when a list of prev/next window buffers
 > is visualized by the tab-line.
 >
 > So here is the patch that finally solves this problem
 > by adding a new option 'switch-to-prev-buffer-wrap'
 > disabled by default.
 >
 > When its value is t, it wraps to the first/last buffer.
 > But when the value is 'stop', it stops at the first/last buffer.

Good idea.  You probably should emphasize the point that if this option
is non-nil, the buffer switched to must have appeared in the window
before.

martin