bug#69662: 30.0.50; PGTK Window system supports drag-and-drop but doesn't define x-begin-drag

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  69662@debbugs.gnu.org
> Date: Thu, 14 Mar 2024 21:52:25 +0800
> 
> > There must be ways around the issue.
> 
> It's only that I'm not volunteering to find them with a band of
> unrepentant megalomaniacs waiting to frustrate me at every stage of the
> process.  Patches welcome, as always, and thanks in advance.

Please also answer my question up-thread:

> What does this mean in practice, though?  Does it mean drag-and-drop
> doesn't work at all in the PGTK builds?  Or only some aspects of that
> don't work?  We should at least document the limitations.