Re: Poll: Change xref-show-definitions-function's default?

[Dmitry Gutov]

On 02.01.2021 17:43, martin rudalics wrote:
>  > Do you mean something like this:
>  > 
> https://github.com/fmdkdd/dotfiles/blob/master/emacs/.emacs.d/elisp/xref-posframe.el? 
>
>
> I don't know.  After evaluating with emacs -Q
>
> (progn
>    (load "~/temp/posframe.el")
>    (load "~/temp/xref-posframe.el")
>    (global-set-key (kbd "M-.") #'xref-posframe-dwim)
>    (find-file "~/emacs-git/quick/src/xdisp.c")
>    (re-search-forward "get_next_display_element"))
>
> I typed M-. and after confirming the TAGS table prompt I got an *xref*
> window below the xdisp.c window displaying
>
> /home/martin/emacs-git/quick/src/xdisp.c
> 7244: #define GET_NEXT_DISPLAY_ELEMENT(
> 7396: get_next_display_element
>
> What I expected was to show these two lines in a menu (or posframe)
> right above or below the "get_next_display_element" string in xdisp.c,
> allow navigation there via <up> and <down> and having <right> or <RET>
> get me to the corresponding tag, simultaneously popping down the menu
> (or posframe).  Have I done something wrong?

Indeed, xref-posframe-dwim doesn't handle the "difficult" case, and it's 
not a suitable xref-show-definitions-function value.

It's a neat experimental feature, though.