#0  0x0000000000000000 in ?? ()
#1  0x00007ffff4501245 in g_closure_invoke (closure=0x783570, return_value=0x0, n_param_values=2, param_values=0x7fffffffcfd0, 
    invocation_hint=0x7fffffffcf70) at /build/buildd/glib2.0-2.42.0/./gobject/gclosure.c:768
#2  0x00007ffff451280b in signal_emit_unlocked_R (node=node@entry=0x7835e0, detail=detail@entry=0, instance=instance@entry=0xac24a0, 
    emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffffffcfd0)
    at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3483
#3  0x00007ffff451b748 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, 
    var_args=var_args@entry=0x7fffffffd160) at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3309
#4  0x00007ffff451b9af in g_signal_emit (instance=instance@entry=0xac24a0, signal_id=<optimized out>, detail=detail@entry=0)
    at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3365
#5  0x00007ffff6da5f61 in _gtk_widget_grab_notify (widget=widget@entry=0xac24a0, was_grabbed=was_grabbed@entry=0)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkwidget.c:8036
#6  0x00007ffff6c7439b in gtk_grab_notify_foreach (child=0xac24a0, data=data@entry=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1996
#7  0x00007ffff6cece85 in gtk_scrolled_window_forall (container=<optimized out>, include_internals=1, 
    callback=0x7ffff6c741e0 <gtk_grab_notify_foreach>, callback_data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkscrolledwindow.c:1796
#8  0x00007ffff6c74404 in gtk_grab_notify_foreach (child=0xa729f0, data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1964
#9  0x00007ffff6b835d7 in gtk_box_forall (container=<optimized out>, include_internals=<optimized out>, 
    callback=0x7ffff6c741e0 <gtk_grab_notify_foreach>, callback_data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkbox.c:2558
#10 0x00007ffff6c74404 in gtk_grab_notify_foreach (child=0xa9b7b0, data=data@entry=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1964
#11 0x00007ffff6cb2a22 in gtk_paned_forall (container=<optimized out>, include_internals=<optimized out>, 
    callback=0x7ffff6c741e0 <gtk_grab_notify_foreach>, callback_data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkpaned.c:2061
#12 0x00007ffff6c74404 in gtk_grab_notify_foreach (child=0xa986d0, data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1964
#13 0x00007ffff6c35780 in gtk_grid_forall (container=<optimized out>, include_internals=<optimized out>, 
    callback=0x7ffff6c741e0 <gtk_grab_notify_foreach>, callback_data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkgrid.c:552
#14 0x00007ffff6c74404 in gtk_grab_notify_foreach (child=0x7753c0, data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1964
#15 0x00007ffff6dbb119 in gtk_window_forall (container=0x9b2540, include_internals=1, 
    callback=0x7ffff6c741e0 <gtk_grab_notify_foreach>, callback_data=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkwindow.c:7934
#16 0x00007ffff6c74404 in gtk_grab_notify_foreach (child=child@entry=0x9b2540, data=data@entry=0x7fffffffd500)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1964
#17 0x00007ffff6c7455b in gtk_grab_notify (group=0x881ae0, device=<optimized out>, old_grab_widget=<optimized out>, 
    new_grab_widget=<optimized out>, from_grab=<optimized out>) at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:2037
#18 0x00007ffff6dced2e in gtk_drag_begin_internal (widget=0xac24a0, widget@entry=0xac4820, site=site@entry=0x0, 
    target_list=0x7735d0, target_list@entry=0xb2a070, actions=(GDK_ACTION_PRIVATE | unknown: 4294954944), 
---Type <return> to continue, or q <return> to quit---
    actions@entry=(GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK | GDK_ACTION_ASK), button=-12432, button@entry=1, 
    event=0xd798b0, x=-1, y=-1) at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkdnd.c:2450
#19 0x00007ffff6dd1fa3 in gtk_drag_begin (widget=0xac4820, targets=0xb2a070, 
    actions=(GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK | GDK_ACTION_ASK), button=1, event=0xd798b0)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkdnd.c:2660
#20 0x0000000000443d33 in ?? ()
#21 0x00007ffff6c763fd in _gtk_marshal_BOOLEAN__BOXED (closure=0xb3db40, return_value=0x7fffffffd850, 
    n_param_values=<optimized out>, param_values=0x7fffffffd900, invocation_hint=<optimized out>, marshal_data=<optimized out>)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmarshalers.c:85
#22 0x00007ffff4501245 in g_closure_invoke (closure=0xb3db40, return_value=0x7fffffffd850, n_param_values=2, 
    param_values=0x7fffffffd900, invocation_hint=0x7fffffffd8a0) at /build/buildd/glib2.0-2.42.0/./gobject/gclosure.c:768
#23 0x00007ffff4512f3c in signal_emit_unlocked_R (node=node@entry=0x782900, detail=detail@entry=0, instance=instance@entry=0xac4820, 
    emission_return=emission_return@entry=0x7fffffffd9b0, instance_and_params=instance_and_params@entry=0x7fffffffd900)
    at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3553
#24 0x00007ffff451b255 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, 
    var_args=var_args@entry=0x7fffffffda90) at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3319
#25 0x00007ffff451b9af in g_signal_emit (instance=instance@entry=0xac4820, signal_id=<optimized out>, detail=detail@entry=0)
    at /build/buildd/glib2.0-2.42.0/./gobject/gsignal.c:3365
#26 0x00007ffff6da6f54 in gtk_widget_event_internal (widget=0xac4820, event=0xd798b0)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkwidget.c:7773
#27 0x00007ffff6c73e0e in propagate_event_up (topmost=<optimized out>, event=<optimized out>, widget=0xac4820)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:2424
#28 propagate_event (widget=<optimized out>, event=0xd798b0, captured=<optimized out>, topmost=0x0)
    at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:2526
#29 0x00007ffff6c75a1e in gtk_main_do_event (event=0xd798b0) at /build/buildd/gtk+3.0-3.14.1/./gtk/gtkmain.c:1748
#30 0x00007ffff681e9e2 in gdk_event_source_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>)
    at /build/buildd/gtk+3.0-3.14.1/./gdk/x11/gdkeventsource.c:364
#31 0x00007ffff422bc5d in g_main_dispatch (context=0x7a1d70) at /build/buildd/glib2.0-2.42.0/./glib/gmain.c:3111
#32 g_main_context_dispatch (context=context@entry=0x7a1d70) at /build/buildd/glib2.0-2.42.0/./glib/gmain.c:3710
#33 0x00007ffff422bf48 in g_main_context_iterate (context=context@entry=0x7a1d70, block=block@entry=1, dispatch=dispatch@entry=1, 
    self=<optimized out>) at /build/buildd/glib2.0-2.42.0/./glib/gmain.c:3781
#34 0x00007ffff422bffc in g_main_context_iteration (context=0x7a1d70, context@entry=0x0, may_block=may_block@entry=1)
    at /build/buildd/glib2.0-2.42.0/./glib/gmain.c:3842
#35 0x00007ffff47e81bc in g_application_run (application=0x775120, argc=1, argv=0x7fffffffdef8)
    at /build/buildd/glib2.0-2.42.0/./gio/gapplication.c:2282
#36 0x000000000042b6b1 in ?? ()
#37 0x00007ffff36ffec5 in __libc_start_main (main=0x42b5f0, argc=1, argv=0x7fffffffdef8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffffffdee8) at libc-start.c:287
#38 0x000000000042b713 in ?? ()
