bug#69993: Wrap window buffers while cycling

[martin rudalics]

> Sorry for the confusion.  This feature request was only about C-x C-left.

... and about C-x C-right presumably.

> C-x b was just speculation about a possible separate option.

Please can we start again from scratch please:

- I do like the idea of having an option to constrain buffers switched
  to via C-x <left> and C-x <right> to those shown in that window
  before.

- I do like the idea of having an option controlling whether C-x <left>
  and C-x <right> should wrap to the last/first buffer (regardless of
  whether buffers switched to appeared in the window before or not).

- I agree that the orders of tabs shown by 'tab-line-mode' should not
  change when a buffer that already appeared in a window is shown again
  in that window - the window's buffer is already highlighted
  appropriately in the tab line in that case.

But this last requirement of 'tab-line-mode' should not affect the order
of buffers in a window's list of previous and next buffers.

martin