https://bugzilla.gnome.org/show_bug.cgi?id=777176
--- Comment #5 from Olivier Fourdan <ofour...@redhat.com> ---
Yes, as you say, xdg-shell v6 positionner definition makes it clear that the
rectangle should not be 0:
https://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/xdg-shell/xdg-shell-unstable-v6.xml#n115
For an xdg_positioner object to be considered complete, it must have a
non-zero size set by set_size, and a non-zero anchor rectangle set by
set_anchor_rect. Passing an incomplete xdg_positioner object when
positioning a surface raises an error.
So the same error occurs with weston as well.
There is a possibility that we can do, though, if the given size is zero, we
use 1 as with attachment 343383 but then compensate by moving the position by
1 pixel in the opposite direction.
Definitely a hack, but that would give the expected result without breaking the
existing rules.
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