Comment 2 for bug 1156387

StacktraceTop:
 sna_damage_combine (dy=-52, dx=-50, r=0x7f49d6aad130, l=0x0) at ../../../src/sna/sna_damage.h:39
 sna_render_composite_redirect_done (sna=0x7f49d4bd4010, op=0x7ffffa2684f0) at ../../../src/sna/sna_render.c:2033
 glyphs_slow (sna=sna@entry=0x7f49d4bd4010, op=op@entry=3 '\003', src=0x7f49d691ea50, dst=dst@entry=0x7f49d6ace2a0, src_x=-50, src_x@entry=34, src_y=-52, nlist=<optimized out>, nlist@entry=1, list=<optimized out>, list@entry=0x7ffffa2688d0, glyphs=0x7ffffa268ce0, glyphs@entry=0x7ffffa268cd0) at ../../../src/sna/sna_glyphs.c:776
 sna_glyphs (op=3 '\003', src=<optimized out>, dst=0x7f49d6ace2a0, mask=0x0, src_x=34, src_y=525, nlist=1, list=0x7ffffa2688d0, glyphs=0x7ffffa268cd0) at ../../../src/sna/sna_glyphs.c:1721
 damageGlyphs (op=<optimized out>, pSrc=0x7f49d691ea50, pDst=0x7f49d6ace2a0, maskFormat=0x0, xSrc=<optimized out>, ySrc=<optimized out>, nlist=1, list=0x7ffffa2688d0, glyphs=0x7ffffa268cd0) at ../../../miext/damage/damage.c:625