Comment 2 for bug 915152

StacktraceTop:
 g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7fa119feb7d9 "update_syntax", message=0x11cd070 "assertion failed: (g_slist_length (ce->priv->invalid) <= 1)") at /build/buildd/glib2.0-2.31.8/./glib/gtestutils.c:1860
 g_assertion_message_expr (domain=0x7fa119fec216 "GtkSourceView", file=0x7fa119fea791 "gtksourcecontextengine.c", line=5595, func=0x7fa119feb7d9 "update_syntax", expr=<optimized out>) at /build/buildd/glib2.0-2.31.8/./glib/gtestutils.c:1871
 update_syntax (ce=0xff62c0, end=0x0, time=10) at gtksourcecontextengine.c:5595
 first_update_callback (ce=0xff62c0) at gtksourcecontextengine.c:2390
 gdk_threads_dispatch (data=<optimized out>) at /build/buildd/gtk+3.0-3.3.6/./gdk/gdk.c:745