Bug#750045: gnuplot: no longer works: assert "m_window" failed in DoGetSize()

[Vincent Lefevre]

Package: gnuplot
Version: 4.6.5-3
Severity: grave
Justification: renders package unusable

After the latest upgrade, gnuplot no longer works. I get the following
error:

../src/gtk/dcclient.cpp(2041): assert "m_window" failed in DoGetSize(): GetSize() doesn't work without window [in thread 7f6cceb45700]

Call stack:
[00] wxOnAssert(char const*, int, char const*, char const*, wchar_t const*)
[01] wxClientDCImpl::DoGetSize(int*, int*) const
[02] wxBufferedDC::UnMask()                  
[03] 0x7f6ce42804f3
[04] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const
[05] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[06] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[07] wxEvtHandler::TryHereOnly(wxEvent&)     
[08] wxEvtHandler::ProcessEventLocally(wxEvent&)
[09] wxEvtHandler::ProcessEvent(wxEvent&)    
[10] wxEvtHandler::SafelyProcessEvent(wxEvent&)
[11] 0x7f6ce3322df1
[12] g_closure_invoke                        
[13] 0x7f6ce2567d3d
[14] g_signal_emit_valist                    
[15] g_signal_emit                           
[16] gtk_widget_size_allocate                
[17] 0x7f6ce3321f03
[18] g_closure_invoke                        
[19] 0x7f6ce2567557
[20] g_signal_emit_valist                    
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
gnuplot: ../../src/xcb_io.c:179: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.11-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gnuplot depends on:
ii  gnuplot-qt [gnuplot-x11]  4.6.5-3

gnuplot recommends no packages.

Versions of packages gnuplot suggests:
pn  feedgnuplot              <none>
ii  gnuplot-doc              4.6.5-3
pn  libgnuplot-iostream-dev  <none>
pn  python-gnuplot           <none>

-- no debconf information