Comment 2 for bug 848922

StacktraceTop:
 g_utf8_pointer_to_offset (str=0x0, pos=0x28 <Address 0x28 out of bounds>) at /build/buildd/glib2.0-2.29.90/./glib/gutf8.c:410
 pango_layout_line_x_to_index (line=0x9afe3a0, x_pos=294912, index=0xbfdcce58, trailing=0xbfdcceac) at /build/buildd/pango1.0-1.29.3/./pango/pango-layout.c:4067
 pango_layout_xy_to_index (layout=0xab135eb0, x=294912, y=11264, index=0xbfdcce58, trailing=0xbfdcceac) at /build/buildd/pango1.0-1.29.3/./pango/pango-layout.c:1984
 gtk_text_layout_get_iter_at_position (layout=0x8484068, target_iter=0xbfdccee8, trailing=0xbfdcceac, x=<optimized out>, y=<optimized out>) at /build/buildd/gtk+3.0-3.1.18/./gtk/gtktextlayout.c:2712
 gtk_text_layout_get_iter_at_pixel (layout=0x8484068, target_iter=0xbfdccee8, x=290, y=47) at /build/buildd/gtk+3.0-3.1.18/./gtk/gtktextlayout.c:2671