bug#52705: 29.0.50; Flashing popups when x-gtk-use-system-tooltips is nil in pgtk

[Po Lu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> But I tested in a non-pgtk build, so I guess it's a pgtk issue.

I have a suspicion it's because how non-system tooltips are implemented
on PGTK is incompatible with how Wayland works as a matter of principle.

It should work fine on X without any issues, even in a PGTK build.

Aleksandr, are you using Wayland and if so, could you try again with
`GDK_BACKEND=x11' in your environment? Thanks.