# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1551710814 -3600
# Node ID afd37ed731f1e213adcbc1950e431f4390725a30
# Parent  90eddb6795210a18494a304fc0ae7d11fc095c1b
revlog: preserve `_lazydelta` attribute in `revlog.clone`

The attribute was introduce in 688fc33e105d, Yuya Nishihara pointed out that
this preservation was missing. This changeset fixes the preservation and make
sure we set the attribute according the modes.

diff -r 90eddb679521 -r afd37ed731f1 mercurial/revlog.py
--- a/mercurial/revlog.py	Mon Mar 04 16:08:44 2019 +0100
+++ b/mercurial/revlog.py	Mon Mar 04 15:46:54 2019 +0100
@@ -2396,21 +2396,25 @@
         if getattr(destrevlog, 'filteredrevs', None):
             raise ValueError(_('destination revlog has filtered revisions'))
 
-        # lazydeltabase controls whether to reuse a cached delta, if possible.
+        # lazydelta and lazydeltabase controls whether to reuse a cached delta,
+        # if possible.
+        oldlazydelta = destrevlog._lazydelta
         oldlazydeltabase = destrevlog._lazydeltabase
         oldamd = destrevlog._deltabothparents
 
         try:
             if deltareuse == self.DELTAREUSEALWAYS:
                 destrevlog._lazydeltabase = True
+                destrevlog._lazydelta = True
             elif deltareuse == self.DELTAREUSESAMEREVS:
                 destrevlog._lazydeltabase = False
+                destrevlog._lazydelta = True
+            elif deltareuse == self.DELTAREUSENEVER:
+                destrevlog._lazydeltabase = False
+                destrevlog._lazydelta = False
 
             destrevlog._deltabothparents = forcedeltabothparents or oldamd
 
-            populatecachedelta = deltareuse in (self.DELTAREUSEALWAYS,
-                                                self.DELTAREUSESAMEREVS)
-
             deltacomputer = deltautil.deltacomputer(destrevlog)
             index = self.index
             for rev in self:
@@ -2428,7 +2432,7 @@
                 # the revlog chunk is a delta.
                 cachedelta = None
                 rawtext = None
-                if populatecachedelta:
+                if destrevlog._lazydelta:
                     dp = self.deltaparent(rev)
                     if dp != nullrev:
                         cachedelta = (dp, bytes(self._chunk(rev)))
@@ -2460,6 +2464,7 @@
                 if addrevisioncb:
                     addrevisioncb(self, rev, node)
         finally:
+            destrevlog._lazydelta = oldlazydelta
             destrevlog._lazydeltabase = oldlazydeltabase
             destrevlog._deltabothparents = oldamd