templates: make divergentnodes in whyunstable keyword be a hybrid list

mercurial/templatekw.py

@@ -809,8 +809,10 b' def showwhyunstable(context, mapping):'
     for entry in entries:
         if entry.get('divergentnodes'):
             dnodes = entry['divergentnodes']
-            entry['divergentnodes'] = ''.join(formatnode(dnode)
-                                              for dnode in dnodes)
+            dnhybrid = _hybrid(None, [dnode.hex() for dnode in dnodes],
+                               lambda x: {'ctx': repo[x]},
+                               lambda x: formatnode(repo[x]))
+            entry['divergentnodes'] = dnhybrid
 
     tmpl = '{instability}:{divergentnodes} {reason} {node|short}'
     return templateutil.mappinglist(entries, tmpl=tmpl, sep='\n')

tests/test-obsolete-divergent.t

@@ -725,6 +725,8 b' Use scmutil.cleanupnodes API to create d'
   content-divergent: 4:70d5a63ca112 (draft) predecessor a178212c3433
   $ hg log -r 1a2a9b5b0030 --hidden -T '{whyunstable%"{instability}:{divergentnodes} {reason} {node}\n"}'
   content-divergent: 4:70d5a63ca112 (draft) predecessor a178212c3433c4e77b573f6011e29affb8aefa33
+  $ hg log -r 1a2a9b5b0030 --hidden -T '{whyunstable%"{instability}:{divergentnodes % " {node} ({phase})"} {reason} {node}\n"}'
+  content-divergent: 70d5a63ca112acb3764bc1d7320ca90ea688d671 (draft) predecessor a178212c3433c4e77b573f6011e29affb8aefa33
 
 #if serve