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.

     1

% simple

     2

port:4:export

     3

port:4:vaportight

     4

port:4:import/export

     5

% all

     6

port:4:4:-:spam:import/export

     7

port:3:4:+:eggs:import/export

     8

port:2:1:-:spam:import

     9

port:2:2:-:spam:export

    10

port:2:1:+:spam:export

    11

port:2:2:+:spam:vaportight

    12

port:2:3:+:spam:import/export

    13

port:1:2:+:eggs:export

    14

port:0:1:+:spam:import

    15

% other

    16

port:4:import/export

    17

% follow

    18

port:0:import

    19

port2:6:4:+:eggs:deport

    20

port:4:4:-:spam:import/export

    21

port:3:4:+:eggs:import/export

    22

port:2:1:-:spam:import

    23

port:2:2:-:spam:export

    24

port:2:1:+:spam:export

    25

port:2:2:+:spam:vaportight

    26

port:2:3:+:spam:import/export

    27

port:1:2:+:eggs:export

    28

port:0:1:+:spam:import

    29

color:3:orange

    30

color:3:+:orange

    31

color:2:-:orange

    32

color:1:+:orange