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

[Tristan Miller]

Greetings.

On Tue, 8 Nov 2016 08:04:20 +0100, Ulrich Sibiller
<uli42 at gmx.de> wrote:
> > 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.

I'm not so sure.  I haven't upgraded the window manager since July
2015, and I'm sure that pull-down menus were working fine until
relatively recently (i.e., in the last month or two).  Also, the problem
happens only when using x2go, not when running applications locally or
over ssh.  I'm using KWin 4.11.20 on the client.  

> > 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?

Yes, using SAL_USE_VCLPLUGIN=gtk, the pull-down menus work in
LibreOffice.  Of course, this is of no help for other GTK+ applications.

> > 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?

Yes.  Pull-down menus for all applications work fine when run locally
on the server (or locally on the client, for that matter).  They also
work fine when I run them remotely via ssh -X.  They appear correctly,
and no error messages are emitted to the console.  It's only when
running them remotely via x2go that they don't work.

Regards,
Tristan

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