rewriteutil: point to help about instability when rewriting creates orphan

This replicates the message from the evolve extension.

Differential Revision: https://phab.mercurial-scm.org/D10517

mercurial/rewriteutil.py

@@ -54,7 +54,10 b" def precheck(repo, revs, action=b'rewrit"
 
     newunstable = disallowednewunstable(repo, revs)
     if newunstable:
-        raise error.InputError(_(b"cannot %s changeset with children") % action)
+        hint = _(b"see 'hg help evolution.instability'")
+        raise error.InputError(
+            _(b"cannot %s changeset with children") % action, hint=hint
+        )
 
 
 def disallowednewunstable(repo, revs):

tests/test-amend.t

@@ -197,6 +197,7 b' Amend in the middle of a stack'
   $ echo 2 >> B
   $ hg amend
   abort: cannot amend changeset with children
+  (see 'hg help evolution.instability')
   [10]
 
 #if obsstore-on

tests/test-branch-change.t

@@ -58,6 +58,7 b' Change in middle of the stack (linear co'
 
   $ hg branch -r 1::3 foo
   abort: cannot change branch of changeset with children
+  (see 'hg help evolution.instability')
   [10]
 
 Change with dirty working directory
@@ -129,6 +130,7 b' Changing on a branch head which is not t'
 
   $ hg branch -r 2 stable
   abort: cannot change branch of changeset with children
+  (see 'hg help evolution.instability')
   [10]
 
 Enabling the allowunstable config and trying to change branch on a branch head

tests/test-fix.t

@@ -1173,6 +1173,7 b' an orphan. We must respect experimental.'
   $ hg commit -m "second"
   $ hg --config experimental.evolution.allowunstable=False fix -r '.^'
   abort: cannot fix changeset with children
+  (see 'hg help evolution.instability')
   [10]
   $ hg fix -r '.^'
   1 new orphan changesets

tests/test-rebase-collapse.t

@@ -550,7 +550,7 b' Test collapsing a middle revision in-pla'
   
   $ hg rebase --collapse -r 1 -d 0
   abort: cannot rebase changeset with children
-  (use --keep to keep original changesets)
+  (see 'hg help evolution.instability')
   [10]
 
 Test collapsing in place

tests/test-rebase-scenario-global.t

@@ -453,7 +453,7 b' Source on have two descendant heads but '
   $ cd ah1
   $ hg rebase -r '2::8' -d 1
   abort: cannot rebase changeset with children
-  (use --keep to keep original changesets)
+  (see 'hg help evolution.instability')
   [10]
   $ hg rebase -r '2::8' -d 1 -k
   rebasing 2:c9e50f6cdc55 "C"
@@ -499,7 +499,7 b' Base on have one descendant heads we ask'
   $ cd ah2
   $ hg rebase -r '3::8' -d 1
   abort: cannot rebase changeset with children
-  (use --keep to keep original changesets)
+  (see 'hg help evolution.instability')
   [10]
   $ hg rebase -r '3::8' -d 1 --keep
   rebasing 3:ffd453c31098 "D"
@@ -542,7 +542,7 b' rebase subset'
   $ cd ah3
   $ hg rebase -r '3::7' -d 1
   abort: cannot rebase changeset with children
-  (use --keep to keep original changesets)
+  (see 'hg help evolution.instability')
   [10]
   $ hg rebase -r '3::7' -d 1 --keep
   rebasing 3:ffd453c31098 "D"
@@ -582,7 +582,7 b' rebase subset with multiple head'
   $ cd ah4
   $ hg rebase -r '3::(7+5)' -d 1
   abort: cannot rebase changeset with children
-  (use --keep to keep original changesets)
+  (see 'hg help evolution.instability')
   [10]
   $ hg rebase -r '3::(7+5)' -d 1 --keep
   rebasing 3:ffd453c31098 "D"

tests/test-split.t

@@ -467,6 +467,7 b' Split a non-head without rebase'
 #if obsstore-off
   $ runsplit -r 1 --no-rebase
   abort: cannot split changeset with children
+  (see 'hg help evolution.instability')
   [10]
 #else
   $ runsplit -r 1 --no-rebase >/dev/null
@@ -518,6 +519,7 b' Split a non-head with obsoleted descenda'
   $ rm .hg/localtags
   $ hg split $B --config experimental.evolution=createmarkers
   abort: cannot split changeset with children
+  (see 'hg help evolution.instability')
   [10]
   $ cat > $TESTTMP/messages <<EOF
   > Split B

tests/test-unamend.t

@@ -284,6 +284,7 b' Unamending in middle of a stack'
 
   $ hg --config experimental.evolution=createmarkers unamend
   abort: cannot unamend changeset with children
+  (see 'hg help evolution.instability')
   [10]
 
   $ hg unamend