Comment 2 for bug 1228857

StacktraceTop:
 gtk_progress_bar_set_fraction (pbar=0xffff00ff, fraction=fraction@entry=0.46153846153846156) at /build/buildd/gtk+3.0-3.8.4/./gtk/gtkprogressbar.c:1024
 progress_dialog_set_percentage (self=self@entry=0x90e72e0, pct=0.46153846153846156) at src/Dialogs.c:8890
 progress_dialog_monitor (self=self@entry=0x90e72e0, count=12, total=26, do_event_loop=do_event_loop@entry=0) at src/Dialogs.c:8951
 _progress_dialog_monitor_progress_monitor (current=12, total=26, do_event_loop=do_event_loop@entry=0, self=self@entry=0x90e72e0) at src/Exporter.c:1652
 exporter_on_exported (j=0xbbb8888, self=0xa4f0910) at src/Exporter.c:870