Dear Maintainer,

Recently, whenever I try to view the HTML part of a mail, the
entire claws-mail app crashes.

So, reproduction:
While reading mail (in the preview pane), with fancy-plugin loaded,
select a mail with an HTML part. Any attempt to show the HTML part --
even with the "view as text" functionality -- immediately crashes
claws-mail.

This happens on X11, doesn't happen with Wayland.

The environment, in case this matters, is KDE.