Bug#798134: marco crashes when plank is set to auto-hide and restores a single window from a group

[Raphaël Halimi]

Package: marco
Version: 1.10.2-1

Hi,

First, please note that I use a Sid box which I update regularly (once
or twice a day) but I rarely log out, so this bug appeared tonight on my
box but it may be caused by an earlier update of marco, or a lib it (or
plank) uses. Since both MATE and Plank have several maintainers in
common I hope you'll be able to investigate further.

If Plank is set to hide (either dodge, auto-hide or intellihide, the
result is the same) and one icon regroups several windows from the same
application, right-clicking on the icon and trying to restore a single
window makes marco crash (and restart).

When it happens, .xsession-errors shows a message like this:

Anomalie dans le gestionnaire de fenêtres : Unexpected X error:
BadWindow (invalid Window parameter) serial 67499 error_code 3
request_code 12 minor_code 0)

(The french part roughly means "anomaly in the window manager").

This doesn't happen when I left-click on the icon (which restores all of
the application's windows), so it may be linked to the window selection
pop-up; and it doesn't happen if Plank isn't set to auto-hide, either.

Also, a hunch tells me that it may be related to a long-crawling bug in
Gtk3 because for quite some time now it has problems with things that
(un)hide, like the top toolbar in VNC clients such as Remmina, Vinagre
or virt-viewer; see for example #771784 or #789763 on Debian BTS,
#1312780 in Launchpad, #1021838 on RedHat BTS or #692860 on Gnome BTS
(no crash involved in these bugs, but the toolbar doesn't appear at all,
or doesn't behave properly, which I witnessed personally in all those
clients since I use VNC quite often on several systems), but please note
that this is only a hunch from a totally non-dev admin.

Regards,

-- 
Raphaël Halimi

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