Avoid extra filelogs entries. Right now, there are some situations in which localrepo.filecommit can create filelog entries even though they're not needed. For example: - permissions for a file have changed; - qrefresh can create a filelog entry identical to its parent (see the added test); - convert-repo creates extra filelog entries in every merge where the first parent has added files (for example, changeset ebebe9577a1a of the kernel repo added extra filelog entries to files in the arch/blackfin directory, even though the merge should only touch the drivers/ata directory). This makes "hg log file" in a converted repo less useful than it could be, since it may mention many merges that don't actually touch that specific file. They all come from the same basic problem: localrepo.commit (through filecommit) creates new filelog entries for all files passed to it (except for some cases during a merge). Patch and test case provided by Benoit. This should fix issue351.

#!/bin/sh

hg init rep; cd rep

touch empty-file
python -c 'for x in range(10000): print x' > large-file

hg addremove

hg commit -m A

rm large-file empty-file
python -c 'for x in range(10,10000): print x' > another-file

hg addremove -s50

hg commit -m B

echo % comparing two empty files caused ZeroDivisionError in the past
hg update -C 0
rm empty-file
touch another-empty-file
hg addremove -s50

cd ..

hg init rep2; cd rep2

python -c 'for x in range(10000): print x' > large-file
python -c 'for x in range(50): print x' > tiny-file

hg addremove

hg commit -m A

python -c 'for x in range(70): print x' > small-file
rm tiny-file
rm large-file

hg addremove -s50

hg commit -m B