Ensure that buffer preview supports general display-buffer

[minad]

The problem is that set-window-configuration only supports the dont-set-miniwindow option since Emacs 28!

Experimenting with these test buffers:

(setq display-buffer-alist
      `(("\\`\\*no-window\\*\\'"
         (display-buffer-no-window))
        ("\\`\\*at-bottom\\*\\'"
         (display-buffer-at-bottom))
        ("\\`\\*in-side-window\\*\\'"
         (display-buffer-in-side-window))
        ("\\`\\*pop-up-window\\*\\'"
         (display-buffer-pop-up-window))))

[minad]

@aki2o The problem is here that we don't have that functionality available on Emacs 27!

[minad]

@aki2o I fixed consult--jump in b5033d2. Please read the code and let me know what you think about it. Does it work in your use case? Unfortunately we cannot merge this for quite some time due to the limitations of set-window-configuration, which doesn't take the no-miniwindow argument before Emacs 28. Do you have an idea on how one could shim that functionality on Emacs 27?

[minad]

Another problem is that the file preview is broken now. When trying to generalize the preview, we really opened Pandora's box :( (EDIT: Actually that works.)

The problem however is that set-window-configuration can still mess with the miniwindow in case the miniwindow is resized during completion. See resize-mini-windows or vertico-resize. The problem also occurs if the mini window is resized via vertico-multiform-mode, e.g. when toggling between the flat or the vertical Vertico display.

[minad]

Close this for now, since it is unclear how the issues in #671 (comment) can be resolved in full generality.