Pass correct username as $HGUSER to hgeditor if "commit -u" is used.
And only use the new util.system parameter to set the environment.
# HG changeset patch
# User test
# Node ID 8ba83d44753d6259db5ce6524974dd1174e90f47
# Parent 0000000000000000000000000000000000000000
1
diff -r 000000000000 -r 8ba83d44753d foo
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/foo Mon Jan 12 13:46:40 1970 +0000
@@ -0,0 +1,1 @@
+a
# HG changeset patch
# User test
# Node ID a1fce69c50d97881c5c014ab23f580f720c78678
# Parent 8ba83d44753d6259db5ce6524974dd1174e90f47
2
diff -r 8ba83d44753d -r a1fce69c50d9 foo
--- a/foo Mon Jan 12 13:46:40 1970 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-a
changeset: 0:8ba83d44753d
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 1
diff -r 000000000000 -r 8ba83d44753d foo
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/foo Mon Jan 12 13:46:40 1970 +0000
@@ -0,0 +1,1 @@
+a
changeset: 1:a1fce69c50d9
tag: tip
user: test
date: Mon Jan 12 13:46:40 1970 +0000
summary: 2
diff -r 8ba83d44753d -r a1fce69c50d9 foo
--- a/foo Mon Jan 12 13:46:40 1970 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-a