bug#25946: 26.0.50; display-buffer ignores ignores reusable-frames in display-buffer-alist

[martin rudalics]

> Indeed.  Nevertheless that function seemed to be the closest
> candidate coming from the documentation on obsolete functionality
> for special frames.

Please suggest better documentation then.

>> Please read also this
>>
>>       If ALIST contains a `pop-up-frame-parameters' entry, the associated
>>       value is added to the newly created frame's parameters.
>
> I did.  At what are you hinting?  I believe that for users this text
> is not of much help as the Emacs manual contains next to nothing on
> frame parameters but points to the elisp manual.

The text is from the Elisp manual and I hinted at it because I thought
there was a frame parameter for controlling dedicatedness.  I was wrong
- there is no such parameter.  You rather have to set the variable
‘display-buffer-mark-dedicated’ to non-nil or bind it around the
‘display-buffer’ call.  That's very ugly.  I think we should provide an
alist entry like the `reusable-frames' one to control the dedicateness
of the window used.

martin