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

[Tristan Miller]

Greetings.

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.

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)


Claws Mail seems to be an exception; it uses GTK+ but its pull-down
menus work fine.

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.

Regards,
Tristan

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
                  Tristan Miller
Free Software developer, ferret herder, logologist
             https://logological.org/
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