[X2Go-User] GTK+ pull-down menus not displayed

[Ulrich Sibiller]

On Tue, Nov 8, 2016 at 4:15 AM, Rett D. Walters <rettw78 at rtwnetwork.com> wrote:
> I can confirm this same issue.  I have two machines running archlinux with
> the latest updates and XFCE4, and I am seeing the exact same behavior.  I
> have noticed that Thunar on these machines doesn't exhibit the issue but
> just about everything else does.  Makes x2go pretty much unusable.  Also
> have the same issue when running openbox on the x2go server, so it doesn't
> appear to be related to the DE running on the server.  Issue appears to
> affect Mac x2goclients as well as linux.
>
> It seems to have occured on one of the servers machines with the issue after
> a recent OS update where the following packages were upgraded (I have
> downgraded libxrender, gtk2, gtk3, to the previous versions and the problem
> still exists, I am not sure what other packages could have this effect) :

What version of nx-libs are you using? You could try to use a nightly
build of nx-libs  (https://sunweavers.net/blog/node/20) and see if
that changes anything. However, there's no nightly for Arch Linux, so
you need to build it yourself.

Otherwise try to downgrade more packages and find the one that breaks things.

I would start with these:
> upgraded libxfixes (5.0.2-1 -> 5.0.3-1)
> upgraded mesa (12.0.2-1 -> 13.0.0-1)
> upgraded mesa-libgl (12.0.2-1 -> 13.0.0-1)
> upgraded pango (1.40.2-1 -> 1.40.3-1)
> upgraded libxtst (1.2.2-1 -> 1.2.3-1)
> upgraded gsettings-desktop-schemas (3.21.4-1 -> 3.22.0+1+g6f52ab5-1)
> upgraded gnome-themes-standard (3.20.2-1 -> 3.22.2-1)
> upgraded libxv (1.0.10-1 -> 1.0.11-1)
> upgraded libxrandr (1.5.0-1 -> 1.5.1-1)
> upgraded gtk2 (2.24.30+95+g876b5f7-1 -> 2.24.31-1)
> upgraded gtk3 (3.20.9-1 -> 3.22.2+4+gc54f348-1)
> upgraded xfconf (4.12.0-4 -> 4.12.1-1)
> upgraded xfce4-panel (4.12.0-2 -> 4.12.1-1)
> upgraded xfce4-settings (4.12.0-5 -> 4.12.1-1)
> installed vte3 (0.46.0+5+g398a3f8-1)
> upgraded xfce4-terminal (0.6.3-3 -> 0.8.1-1)
> upgraded xfdesktop (4.12.3-2 -> 4.12.3-3)


> upgraded wayland (1.11.0-1 -> 1.12.0-1)

You are not using wayland, are you?

> Lately whenever I launch GTK+ applications over x2go, the
> pull-down menus are usually not displayed properly or at all.
>
> For example, if I launch the Xfce Terminal, I see the usual "File",
> "Edit", "View", "Terminal", "Tabs", and "Help" labels in the pull-down
> menu bar.  If I click on these, they become underlined as though they
> are active, but the corresponding pull-down menu doesn't (usually)
> appear.  Instead, a single pixel in the upper left corner of my desktop
> turns white.  The only exception is when I click on "Help" -- the first
> time I do this, I do get a pull-down menu, but it's attached to the
> upper left corner of my desktop, not to the "Help" label in the Terminal
> window. The menu is very small, though, and I need to scroll through it
> to see all the entries.  The second or subquent times I try to view the
> "Help" menu, I just get a single pixel.

This sounds like a window manager problem.

> Similar behaviour is observed in most other GTK+2 and GTK+3
> applications, such as the GNOME Terminal and the GNOME Character Map.
> The problem is reproducible when launhcing LibreOffice with
> SAL_USE_VCLPLUGIN=gtk2 or SAL_USE_VCLPLUGIN=gtk3, but not with
> SAL_USE_VCLPLUGIN=kde4 or SAL_USE_VCLPLUGIN=gen.  Some (but not all) of
> the applications output error messages like this to the console when I
> try to activate a pull-down menu:
>
> (gucharmap:26208): Gtk-CRITICAL **:
> gtk_widget_get_preferred_height_for_width: assertion 'width >= 0' failed
>
> (gucharmap:26208): Gtk-CRITICAL **:
> gtk_widget_get_preferred_height_for_width: assertion 'width >= 0' failed
>
> (gucharmap:26208): Gtk-CRITICAL **:
> gtk_widget_get_preferred_height_for_width: assertion 'width >= 0' failed
>
> (gucharmap:26208): Gtk-WARNING **: Negative content width -7 (allocation 1,
> extents 4x4) while allocating gadget (node arrow, owner GtkMenu)
>
> (gucharmap:26208): Gtk-WARNING **: Negative content width -7 (allocation 1,
> extents 4x4) while allocating gadget (node arrow, owner GtkMenu)

Googling for these messages leads to bugs regarding xwayland and HiDPI
monitors, which does not fit in here (e.g.:
https://bugs.documentfoundation.org/show_bug.cgi?id=99508), but they
sugges using

SAL_USE_VCLPLUGIN=gtk

Does that help?

> Anyone know what the cause might be and how I can work around it?  I'm
> running x2goserver-4.0.1.19 on an openSUSE Tumbleweed server and
> x2goclient-4.0.5.0 on an openSUSE 13.2 client.  The client desktop
> environment is KDE 5.

Have you checked if it works at all without x2go?

Uli