patch: restore the previous output of 'diff --stat'

Restore the previous diffstat behaviour of scaling by the maximum number of
changes to a single file. Changeset f03f08240c32 modified the diffstat to be
scaled by the total number of changes. This seems to have been unintentional.

mercurial/patch.py

@@ -1672,14 +1672,15 b' def trydiff(repo, revs, ctx1, ctx2, modi'
                 yield text
 
 def diffstatsum(stats):
-    maxfile, addtotal, removetotal, binary = 0, 0, 0, False
+    maxfile, maxtotal, addtotal, removetotal, binary = 0, 0, 0, 0, False
     for f, a, r, b in stats:
         maxfile = max(maxfile, encoding.colwidth(f))
+        maxtotal = max(maxtotal, a + r)
         addtotal += a
         removetotal += r
         binary = binary or b
 
-    return maxfile, addtotal, removetotal, binary
+    return maxfile, maxtotal, addtotal, removetotal, binary
 
 def diffstatdata(lines):
     diffre = re.compile('^diff .*-r [a-z0-9]+\s(.*)$')
@@ -1712,8 +1713,7 b' def diffstatdata(lines):'
 def diffstat(lines, width=80, git=False):
     output = []
     stats = diffstatdata(lines)
-    maxname, totaladds, totalremoves, hasbinary = diffstatsum(stats)
-    maxtotal = totaladds + totalremoves
+    maxname, maxtotal, totaladds, totalremoves, hasbinary = diffstatsum(stats)
 
     countwidth = len(str(maxtotal))
     if hasbinary and countwidth < 3:

mercurial/templatekw.py

@@ -186,7 +186,7 b' def showdiffstat(repo, ctx, templ, **arg'
     "modified files: +added/-removed lines"
     """
     stats = patch.diffstatdata(util.iterlines(ctx.diff()))
-    maxname, adds, removes, binary = patch.diffstatsum(stats)
+    maxname, maxtotal, adds, removes, binary = patch.diffstatsum(stats)
     return '%s: +%s/-%s' % (len(stats), adds, removes)
 
 def showextras(**args):

tests/test-diffstat.t

@@ -2,18 +2,22 b''
   $ cd repo
   $ i=0; while [ "$i" -lt 213 ]; do echo a >> a; i=`expr $i + 1`; done
   $ hg add a
+  $ cp a b
+  $ hg add b
 
 Wide diffstat:
 
   $ hg diff --stat
    a |  213 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-   1 files changed, 213 insertions(+), 0 deletions(-)
+   b |  213 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+   2 files changed, 426 insertions(+), 0 deletions(-)
 
 diffstat width:
 
   $ COLUMNS=24 hg diff --config ui.interactive=true --stat
    a |  213 ++++++++++++++
-   1 files changed, 213 insertions(+), 0 deletions(-)
+   b |  213 ++++++++++++++
+   2 files changed, 426 insertions(+), 0 deletions(-)
 
   $ hg ci -m adda
 
@@ -31,19 +35,19 b' Narrow diffstat:'
 
   $ hg ci -m appenda
 
-  $ printf '\0' > b
-  $ hg add b
+  $ printf '\0' > c
+  $ hg add c
 
 Binary diffstat:
 
   $ hg diff --stat
-   b |    0 
+   c |    0 
    1 files changed, 0 insertions(+), 0 deletions(-)
 
 Binary git diffstat:
 
   $ hg diff --stat --git
-   b |  Bin 
+   c |  Bin 
    1 files changed, 0 insertions(+), 0 deletions(-)
 
   $ hg ci -m createb