largefiles: invoke "normallookup" on "lfdirstate" for merged files

Before this patch, largefiles gotten from "other" revision (with
conflict) at "hg merge" become "clean" unexpectedly in steps below:

    1. "repo.status()" is invoked (for status check before merging)
      1-1 "dirstate" entry for standinfile SF is "normal"-ed
      1-2 "lfdirstate" entry of largefile LF (for SF) is "normal"-ed

    2. "merge.update()" is invoked
      2-1 SF is updated in the working directory
          (ASSUMPTION: user choice "other" at conflict)
      2-2 "dirstate" entry for SF is "merge"-ed

    3. "lfcommands.updatelfiles()" is invoked (by "overrides.hgmerge()")
      3-1 largefile LF (for SF) is updated in the working directory
      3-2 "dirstate" returns "m" for SF (by 2-2)
      3-3 "lfdirstate" entry for LF is left as it is
      3-4 "lfdirstate" is written into ".hg/largefiles/dirstate", and
          timestamp of LF is stored into "lfdirstate" file (by 1-2)
          (ASSUMPTION: timestamp of LF differs from one of "lfdirstate" file)

Then, "hs status" treats LF as "clean", even though LF is updated by
"other" revision (by 3-1), because "lfilesrepo.status()" always treats
"normal"-ed files (by 1-2 and 3-4) as "clean".

When state of standinfile in "dirstate" is "m", largefile should be
"normallookup"-ed.

This patch invokes "normallookup" on "lfdirstate" for merged files.

This patch uses "[debug] dirstate.delaywrite" feature in the test, to
ensure that timestamp of the largefile gotten from "other" revision is
stored into ".hg/largefiles/dirstate". (for ASSUMPTION at 3-4)

hgext/largefiles/lfcommands.py

@@ -521,6 +521,8 b' def updatelfiles(ui, repo, filelist=None'
                     lfdirstate.normallookup(lfile)
                 else:
                     lfdirstate.normal(lfile)
+            elif state == 'm':
+                lfdirstate.normallookup(lfile)
             elif state == 'r':
                 lfdirstate.remove(lfile)
             elif state == 'a':

tests/test-largefiles-update.t

@@ -50,4 +50,33 b' Test that "hg merge" updates largefiles '
   -4669e532d5b2c093a78eca010077e708a071bb64
   +58e24f733a964da346e2407a2bee99d9001184f5
 
+(getting largefiles from "other" via conflict prompt)
+
+  $ hg update -q -C 2
+  $ echo 'large1 in #3' > large1
+  $ echo 'normal1 in #3' > normal1
+  $ hg commit -m '#3'
+  $ cat .hglf/large1
+  e5bb990443d6a92aaf7223813720f7566c9dd05b
+  $ hg merge --config debug.dirstate.delaywrite=2 --config ui.interactive=True <<EOF
+  > o
+  > EOF
+  largefile large1 has a merge conflict
+  ancestor was 4669e532d5b2c093a78eca010077e708a071bb64
+  keep (l)ocal e5bb990443d6a92aaf7223813720f7566c9dd05b or
+  take (o)ther 58e24f733a964da346e2407a2bee99d9001184f5? merging normal1
+  warning: conflicts during merge.
+  merging normal1 incomplete! (edit conflicts, then use 'hg resolve --mark')
+  0 files updated, 1 files merged, 0 files removed, 1 files unresolved
+  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
+  getting changed largefiles
+  1 largefiles updated, 0 removed
+  [1]
+  $ hg status -A large1
+  M large1
+  $ cat large1
+  large1 in #1
+  $ cat .hglf/large1
+  58e24f733a964da346e2407a2bee99d9001184f5
+
   $ cd ..