--- a/tests/test-show-work.t	Thu Aug 03 21:51:34 2017 -0700
+++ b/tests/test-show-work.t	Wed Sep 13 21:15:46 2017 -0700
@@ -16,20 +16,20 @@
   $ hg -q commit -A -m 'commit 0'
 
   $ hg show work
-  @  9f171 commit 0
+  @  9f17 commit 0
 
 Even when it isn't the wdir
 
   $ hg -q up null
 
   $ hg show work
-  o  9f171 commit 0
+  o  9f17 commit 0
 
 Single changeset is still there when public because it is a head
 
   $ hg phase --public -r 0
   $ hg show work
-  o  9f171 commit 0
+  o  9f17 commit 0
 
 A draft child will show both it and public parent
 
@@ -38,8 +38,8 @@
   $ hg commit -m 'commit 1'
 
   $ hg show work
-  @  181cc commit 1
-  o  9f171 commit 0
+  @  181c commit 1
+  o  9f17 commit 0
 
 Multiple draft children will be shown
 
@@ -47,16 +47,16 @@
   $ hg commit -m 'commit 2'
 
   $ hg show work
-  @  128c8 commit 2
-  o  181cc commit 1
-  o  9f171 commit 0
+  @  128c commit 2
+  o  181c commit 1
+  o  9f17 commit 0
 
 Bumping first draft changeset to public will hide its parent
 
   $ hg phase --public -r 1
   $ hg show work
-  @  128c8 commit 2
-  o  181cc commit 1
+  @  128c commit 2
+  o  181c commit 1
   |
   ~
 
@@ -68,10 +68,10 @@
   created new head
 
   $ hg show work
-  @  f0abc commit 3
-  | o  128c8 commit 2
+  @  f0ab commit 3
+  | o  128c commit 2
   |/
-  o  181cc commit 1
+  o  181c commit 1
   |
   ~
 
@@ -80,10 +80,10 @@
   $ hg -q up null
 
   $ hg show work
-  o  f0abc commit 3
-  | o  128c8 commit 2
+  o  f0ab commit 3
+  | o  128c commit 2
   |/
-  o  181cc commit 1
+  o  181c commit 1
   |
   ~
 
@@ -95,13 +95,13 @@
   created new head
 
   $ hg show work
-  @  668ca commit 4
-  | o  f0abc commit 3
-  | | o  128c8 commit 2
+  @  668c commit 4
+  | o  f0ab commit 3
+  | | o  128c commit 2
   | |/
-  | o  181cc commit 1
+  | o  181c commit 1
   |/
-  o  9f171 commit 0
+  o  9f17 commit 0
 
   $ cd ..
 
@@ -126,11 +126,11 @@
   $ hg commit -m 'commit 4'
 
   $ hg show work
-  @  f8dd3 (mybranch) commit 4
-  o  90cfc (mybranch) commit 3
-  | o  128c8 commit 2
+  @  f8dd (mybranch) commit 4
+  o  90cf (mybranch) commit 3
+  | o  128c commit 2
   |/
-  o  181cc commit 1
+  o  181c commit 1
   |
   ~
 
@@ -157,11 +157,11 @@
   $ hg bookmark mybook
 
   $ hg show work
-  @  cac82 (mybook) commit 4
-  o  f0abc commit 3
-  | o  128c8 (@) commit 2
+  @  cac8 (mybook) commit 4
+  o  f0ab commit 3
+  | o  128c (@) commit 2
   |/
-  o  181cc commit 1
+  o  181c commit 1
   |
   ~
 
@@ -182,9 +182,9 @@
   $ hg tag 0.2
 
   $ hg show work
-  @  37582 Added tag 0.2 for changeset 6379c25b76f1
-  o  6379c (0.2) commit 3
-  o  a2ad9 Added tag 0.1 for changeset 6a75536ea0b1
+  @  3758 Added tag 0.2 for changeset 6379c25b76f1
+  o  6379 (0.2) commit 3
+  o  a2ad Added tag 0.1 for changeset 6a75536ea0b1
   |
   ~
 
@@ -205,15 +205,15 @@
   $ hg commit -m 'commit 2'
 
   $ hg show work
-  @  34834 (mybook) (mybranch) commit 2
-  o  97fcc commit 1
+  @  3483 (mybook) (mybranch) commit 2
+  o  97fc commit 1
 
 Multiple bookmarks on same changeset render properly
 
   $ hg book mybook2
   $ hg show work
-  @  34834 (mybook mybook2) (mybranch) commit 2
-  o  97fcc commit 1
+  @  3483 (mybook mybook2) (mybranch) commit 2
+  o  97fc commit 1
 
   $ cd ..
 
@@ -230,8 +230,38 @@
   $ hg commit -m 'commit 3'
 
   $ hg --config extensions.revnames=$TESTDIR/revnamesext.py show work
-  @  32f3e (r2) commit 3
-  o  6a755 (r1) commit 2
-  o  97fcc (r0) commit 1
+  @  32f3 (r2) commit 3
+  o  6a75 (r1) commit 2
+  o  97fc (r0) commit 1
 
   $ cd ..
+
+Prefix collision on hashes increases shortest node length
+
+  $ hg init hashcollision
+  $ cd hashcollision
+  $ echo 0 > a
+  $ hg -q commit -Am 0
+  $ for i in 17 1057 2857 4025; do
+  >   hg -q up 0
+  >   echo $i > a
+  >   hg -q commit -m $i
+  >   echo 0 > a
+  >   hg commit -m "$i commit 2"
+  > done
+
+  $ hg show work
+  @  cfd04 4025 commit 2
+  o  c562d 4025
+  | o  08048 2857 commit 2
+  | o  c5623 2857
+  |/
+  | o  6a6b6 1057 commit 2
+  | o  c5625 1057
+  |/
+  | o  96b4e 17 commit 2
+  | o  11424 17
+  |/
+  o  b4e73 0
+
+  $ cd ..