Okay.  What about making it work when specifying a frame, and building with
a toolkit?  It seems there is an outer-window-id (which is the top-level
window as far as the window manager and other X programs like xprop are
concerned), and then there is window-id.

While I see now that this can be worked around in elisp, shouldn't
x-window-property use outer-window-id when a frame is specified, since that
is almost certainly what is desired?


On Wed, May 21, 2014 at 12:27 AM, Andreas Schwab <schwab@suse.de> wrote:

> Jeremy Maitin-Shepard <jeremy@jeremyms.com> writes:
>
> > x-window-property seems to return nil for most properties.
> >
> > (x-window-property "WM_HINTS")  -> returns non-nil
> >
> > (x-window-property "WM_NAME") -> returns nil even though the property is
> > set (and displayed by xprop)
> >
> > (x-window-property "_NET_WM_STATE") -> returns nil even though property
> is
> > set
> >
> > In fact I haven't found any property I can read other than WM_HINTS.
>
> You can, if you use the same window id for the target window as xprop
> (or build emacs without toolkit).
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@suse.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."
>