[merge][#288751] avoid creating text deltas spanning repository stacks

[Bundle Buggy]

Bundle Buggy has detected this merge request.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3Ce01316480811140019o23524db3oc1e7de89962eb542%40mail.gmail.com%3E
Project: Bazaar