# HG changeset patch
# User Martijn Pieters <mjpieters@fb.com>
# Date 1461173189 -3600
# Node ID f303b569134c0c32b7863371fbd62f646e25f7fa
# Parent  25d93c61cef4f25d80fa37219851c312e291f6c3
graphmod: fix seen state handling for > 2 parents (issue5174)

When there are more than 2 parents for a given node (in a sparse graph), extra
dummy nodes are inserted to transition the lines more gradually. However, since
the seen state was not updated when yielding the extra nodes, the wrong graph
styles were being applied to the nodes.

diff -r 25d93c61cef4 -r f303b569134c mercurial/graphmod.py
--- a/mercurial/graphmod.py	Wed Apr 20 21:33:02 2016 +0000
+++ b/mercurial/graphmod.py	Wed Apr 20 18:26:29 2016 +0100
@@ -401,6 +401,7 @@
     edges = [(nodeidx, nextseen.index(p))
              for p in knownparents if p != nullrev]
 
+    seen[:] = nextseen
     while len(newparents) > 2:
         # ascii() only knows how to add or remove a single column between two
         # calls. Nodes with more than two parents break this constraint so we
@@ -422,7 +423,6 @@
     if len(newparents) > 1:
         edges.append((nodeidx, nodeidx + 1))
     nmorecols = len(nextseen) - ncols
-    seen[:] = nextseen
     # remove current node from edge characters, no longer needed
     state['edges'].pop(rev, None)
     yield (type, char, lines, (nodeidx, edges, ncols, nmorecols))
diff -r 25d93c61cef4 -r f303b569134c tests/test-glog.t
--- a/tests/test-glog.t	Wed Apr 20 21:33:02 2016 +0000
+++ b/tests/test-glog.t	Wed Apr 20 18:26:29 2016 +0100
@@ -2736,3 +2736,58 @@
   
   
   $ cd ..
+
+When inserting extra line nodes to handle more than 2 parents, ensure that
+the right node styles are used (issue5174):
+
+  $ hg init repo-issue5174
+  $ cd repo-issue5174
+  $ echo a > f0
+  $ hg ci -Aqm 0
+  $ echo a > f1
+  $ hg ci -Aqm 1
+  $ echo a > f2
+  $ hg ci -Aqm 2
+  $ hg co ".^"
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ echo a > f3
+  $ hg ci -Aqm 3
+  $ hg co ".^^"
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ echo a > f4
+  $ hg ci -Aqm 4
+  $ hg merge -r 2
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ hg ci -qm 5
+  $ hg merge -r 3
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ hg ci -qm 6
+  $ hg log -G -r '0 | 1 | 2 | 6'
+  @    changeset:   6:851fe89689ad
+  :\   tag:         tip
+  : :  parent:      5:4f1e3cf15f5d
+  : :  parent:      3:b74ba7084d2d
+  : :  user:        test
+  : :  date:        Thu Jan 01 00:00:00 1970 +0000
+  : :  summary:     6
+  : :
+  : \
+  : :\
+  : o :  changeset:   2:3e6599df4cce
+  : :/   user:        test
+  : :    date:        Thu Jan 01 00:00:00 1970 +0000
+  : :    summary:     2
+  : :
+  : o  changeset:   1:bd9a55143933
+  :/   user:        test
+  :    date:        Thu Jan 01 00:00:00 1970 +0000
+  :    summary:     1
+  :
+  o  changeset:   0:870a5edc339c
+     user:        test
+     date:        Thu Jan 01 00:00:00 1970 +0000
+     summary:     0
+  
+