dirstate: use wlock and changing_files context in `test-revlog-ancestry`

This is the way.

tests/test-revlog-ancestry.py

@@ -1,92 +1,94
 import os
 from mercurial import (
     hg,
     merge,
     ui as uimod,
 )
 
 u = uimod.ui.load()
 
 repo = hg.repository(u, b'test1', create=1)
 os.chdir('test1')
 
 
 def commit(text, time):
     repo.commit(text=text, date=b"%d 0" % time)
 
 
 def addcommit(name, time):
     f = open(name, 'wb')
     f.write(b'%s\n' % name)
     f.close()
+    with repo.wlock():
+        with repo.dirstate.changing_files(repo):
     repo[None].add([name])
     commit(name, time)
 
 
 def update(rev):
     merge.clean_update(repo[rev])
 
 
 def merge_(rev):
     merge.merge(repo[rev])
 
 
 if __name__ == '__main__':
     addcommit(b"A", 0)
     addcommit(b"B", 1)
 
     update(0)
     addcommit(b"C", 2)
 
     merge_(1)
     commit(b"D", 3)
 
     update(2)
     addcommit(b"E", 4)
     addcommit(b"F", 5)
 
     update(3)
     addcommit(b"G", 6)
 
     merge_(5)
     commit(b"H", 7)
 
     update(5)
     addcommit(b"I", 8)
 
     # Ancestors
     print('Ancestors of 5')
     for r in repo.changelog.ancestors([5]):
         print(r, end=' ')
 
     print('\nAncestors of 6 and 5')
     for r in repo.changelog.ancestors([6, 5]):
         print(r, end=' ')
 
     print('\nAncestors of 5 and 4')
     for r in repo.changelog.ancestors([5, 4]):
         print(r, end=' ')
 
     print('\nAncestors of 7, stop at 6')
     for r in repo.changelog.ancestors([7], 6):
         print(r, end=' ')
 
     print('\nAncestors of 7, including revs')
     for r in repo.changelog.ancestors([7], inclusive=True):
         print(r, end=' ')
 
     print('\nAncestors of 7, 5 and 3, including revs')
     for r in repo.changelog.ancestors([7, 5, 3], inclusive=True):
         print(r, end=' ')
 
     # Descendants
     print('\n\nDescendants of 5')
     for r in repo.changelog.descendants([5]):
         print(r, end=' ')
 
     print('\nDescendants of 5 and 3')
     for r in repo.changelog.descendants([5, 3]):
         print(r, end=' ')
 
     print('\nDescendants of 5 and 4')
     print(*repo.changelog.descendants([5, 4]), sep=' ')