merge: make 'keep' message more descriptive

Most merge action messages don't describe the action itself, they
describe the reason the action was taken. The only exeption is the 'k'
action, for which the message is just "keep" and instead there is a
code comment folling it that says "remote unchanged". Let's move that
comment into the merge action message.

mercurial/merge.py

@@ -427,7 +427,7 b' def manifestmerge(repo, wctx, p2, pa, br'
                 fla = ma.flags(f)
                 nol = 'l' not in fl1 + fl2 + fla
                 if n2 == a and fl2 == fla:
-                    actions['k'].append((f, (), "keep")) # remote unchanged
+                    actions['k'].append((f, (), "remote unchanged"))
                 elif n1 == a and fl1 == fla: # local unchanged - use remote
                     if n1 == n2: # optimization: keep local content
                         actions['e'].append((f, (fl2,), "update permissions"))

tests/test-graft.t

@@ -168,7 +168,7 b' Graft out of order, skipping a merge and'
    e: remote is newer -> g
   getting e
   updating: e 1/1 files (100.00%)
-   b: keep -> k
+   b: remote unchanged -> k
   e
   grafting revision 4
     searching for copies back to rev 1
@@ -179,7 +179,7 b' Graft out of order, skipping a merge and'
    d: remote is newer -> g
   getting d
   updating: d 1/2 files (50.00%)
-   b: keep -> k
+   b: remote unchanged -> k
    e: versions differ -> m
   updating: e 2/2 files (100.00%)
   picked tool 'internal:merge' for e (binary False symlink False)

tests/test-issue672.t

@@ -40,7 +40,7 b' http://mercurial.selenic.com/bts/issue67'
    1a: remote created -> g
   getting 1a
   updating: 1a 2/2 files (100.00%)
-   2: keep -> k
+   2: remote unchanged -> k
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 

tests/test-merge-criss-cross.t

@@ -141,7 +141,7 b' Redo merge with merge.preferancestor="*"'
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 40663881a6dd, local: 3b08d01b0ab5+, remote: adfe50279922
-   f2: keep -> k
+   f2: remote unchanged -> k
    f1: versions differ -> m
   
   auction for merging merge bids
@@ -152,7 +152,7 b' Redo merge with merge.preferancestor="*"'
    f1: remote is newer -> g
   getting f1
   updating: f1 1/1 files (100.00%)
-   f2: keep -> k
+   f2: remote unchanged -> k
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 
@@ -176,7 +176,7 b' The other way around:'
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 0f6b37dbe527, local: adfe50279922+, remote: 3b08d01b0ab5
-   f1: keep -> k
+   f1: remote unchanged -> k
    f2: versions differ -> m
   
   calculating bids for ancestor 40663881a6dd
@@ -195,7 +195,7 b' The other way around:'
    f2: remote is newer -> g
   getting f2
   updating: f2 1/1 files (100.00%)
-   f1: keep -> k
+   f1: remote unchanged -> k
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 
@@ -249,7 +249,7 b' Verify how the output looks and and how '
   resolving manifests
    branchmerge: True, force: False, partial: False
    ancestor: 40663881a6dd, local: 3b08d01b0ab5+, remote: adfe50279922
-   f2: keep -> k
+   f2: remote unchanged -> k
    f1: versions differ -> m
   
   auction for merging merge bids
@@ -260,7 +260,7 b' Verify how the output looks and and how '
    f1: remote is newer -> g
   getting f1
   updating: f1 1/1 files (100.00%)
-   f2: keep -> k
+   f2: remote unchanged -> k
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
 

tests/test-rename-merge2.t

@@ -88,7 +88,7 b' args:'
    ancestor: 924404dff337, local: e300d1c794ec+, remote: 4ce40f5aca24
    preserving a for resolve of b
    preserving rev for resolve of rev
-   a: keep -> k
+   a: remote unchanged -> k
    b: remote copied from a -> m
   updating: b 1/2 files (50.00%)
   picked tool 'python ../merge' for b (binary False symlink False)
@@ -573,7 +573,7 b' m "um a c" "um x c" " " "10 do merg'
    ancestor: 924404dff337, local: 0b76e65c8289+, remote: 4ce40f5aca24
    preserving b for resolve of b
    preserving rev for resolve of rev
-   a: keep -> k
+   a: remote unchanged -> k
    b: both created -> m
   updating: b 1/2 files (50.00%)
   picked tool 'python ../merge' for b (binary False symlink False)