bzr 2.5 does not flush stdout often enough?

[Alexander Belchenko]

I want to ask about any recent changes probably made in bzr 2.5. I've
noticed that in QBzr windows I see stdout output of bzr commands with
big delay, but I used to see them instantly when bzr in subprocess
produced it.

I suspect that bzr 2.5 does not use flush for stdout anymore, but it
used to use it before.

Any bell rings?