stream: in v3, skip the "size" fast path if the entries as some unknown size
We are about to prefetch size during the lock less in the v3 case. So we need to
avoid trying to use that prefetched size when it is not available.
See next changeset for the motivation.
$ cat >> $HGRCPATH <<EOF
> [extensions]
> drawdag=$TESTDIR/drawdag.py
> bruterebase=$TESTDIR/bruterebase.py
> [experimental]
> evolution.createmarkers=True
> evolution.allowunstable=True
> EOF
$ init() {
> N=`expr ${N:-0} + 1`
> cd $TESTTMP && hg init repo$N && cd repo$N
> hg debugdrawdag
> }
Source looks like "N"
$ init <<'EOS'
> C D
> |\|
> A B Z
> EOS
$ hg debugbruterebase 'all()-Z' Z
A: A':Z
B: B':Z
AB: A':Z B':Z
C: ABORT: cannot rebase 3:a35c07e8a2a4 without moving at least one of its parents
AC: A':Z C':A'B
BC: B':Z C':B'A
ABC: A':Z B':Z C':A'B'
D: D':Z
AD: A':Z D':Z
BD: B':Z D':B'
ABD: A':Z B':Z D':B'
CD: ABORT: cannot rebase 3:a35c07e8a2a4 without moving at least one of its parents
ACD: A':Z C':A'B D':Z
BCD: B':Z C':B'A D':B'
ABCD: A':Z B':Z C':A'B' D':B'
Moving backwards
$ init <<'EOS'
> C
> |\
> A B
> |
> Z
> EOS
$ hg debugbruterebase 'all()-Z' Z
B: B':Z
A:
BA: B':Z
C: ABORT: cannot rebase 3:b8d7149b562b without moving at least one of its parents
BC: B':Z C':B'A
AC:
BAC: B':Z C':B'A