Re: Add function to rotate/transpose all windows

[martin rudalics]

>> https://www.emacswiki.org/emacs/TransposeFrame
>> The code in this has the following limitations:
>> - Does not work in emacs 29.1

It works here when I remove the

(window-redisplay-end-trigger tree)

(set-window-redisplay-end-trigger window (pop config))

lines in such versions.

>> - No good way to transpose only specific parts of window tree

Then the FRAME arguments should probably become WINDOW-OR-FRAME and
accept arbitrary internal windows as value.

> Thanks.
>
> Martin, any comments or suggestions?

The problem of any such package is that Emacs never provided a suitable
balance between explicit management of objects like buffers or windows
(via 'kill-buffer' and 'delete-window') and the subsequent internal
handling of these objects.

In particular, the 'delete-window'/'split-window' paradigm may fail when
window objects have been stored in variables.  Take this excerpt from
TransposeFrame

                           (if (eq (overlay-get ol 'window) orig-window)
                               (overlay-put ol 'window window))))

If this gets called within a 'save-window-excursion', then the 'window'
property of overlays may change from 'orig-window' to 'window'.  When
'save-window-excursion' exits and restores 'orig-window' and deletes
'window', these overlays will now reference a dead window.  This problem
could be partially fixed by using the 'clone-of' parameter of the
window.  But that would fail when windows are rotated a second time.

Such problems could be fixed if we were able to reference windows by
their number (or an arbitrary name) and have Lisp references to a window
use that number instead of the object.  It might, however, take
considerable time to have such a concept enter the minds of people used
to storing window identities as Lisp objects.

martin