[trac] Too many concurrent resync attempts

[Luis Matos <gass@otiliamatos.ath.cx>]

hello there

i want to ask if this is a too big diff for inclusion in r1:

http://trac.edgewall.org/changeset/4966

http://trac.edgewall.org/changeset/4966?format=diff&new=4966

this is beacuse of #425909 [0] that states "Trac fails miserably  when
there are too many concurrent resync attempts"

[0] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=425909

best regards

Luis Matos