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bug#30074: 26.0; Add function(s) for current monitor info

From: Lars Ingebrigtsen
Subject: bug#30074: 26.0; Add function(s) for current monitor info
Date: Sun, 14 Jul 2019 19:46:42 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Drew Adams <address@hidden> writes:

> Please consider adding a function that returns the info describing the
> monitor that dominates a frame (default: selected frame).  In
> particular, the size of the monitor.  This can be useful, for example,
> for positioning a frame when there are multiple monitors.
> I've been using this, but you might have a better implementation in
> mind:
> (defun current-monitor (&optional frame)
>   "Attributes of monitor that dominates FRAME (default: `selected-frame')."
>   (catch 'current-monitor
>     (dolist (atts  (display-monitor-attributes-list frame))
>       (when (member (or frame  (selected-frame)) (cdr (assq 'frames atts)))
>         (throw 'current-monitor atts)))
>     nil))                              ; Should never happen (?)

I guess it's possible for a frame to be on several monitors?  (Half on
one and half on another.)  What would this function return in that case?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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