histedit: disable color while rendering template for use in plan

Differential Revision: https://phab.mercurial-scm.org/D9324

hgext/histedit.py

@@ -525,7 +525,11 b' class histeditaction(object):'
         """
         ctx = self.repo[self.node]
         ui = self.repo.ui
-        with ui.configoverride({}, b'histedit'):
+        # We don't want color codes in the commit message template, so
+        # disable the label() template function while we render it.
+        with ui.configoverride(
+            {(b'templatealias', b'label(l,x)'): b"x"}, b'histedit'
+        ):
             summary = cmdutil.rendertemplate(
                 ctx, ui.config(b'histedit', b'summary-template')
             )

tests/test-histedit-commute.t

@@ -107,10 +107,10 b' test customization of revision summary'
 colors in the custom template don't show up in the editor
   $ HGEDITOR=cat hg histedit 177f92b77385 --color=debug \
   >  --config histedit.summary-template='I am rev {label("rev", rev)}'
-  pick 177f92b77385 I am rev [rev|2]
-  pick 055a42cdd887 I am rev [rev|3]
-  pick e860deea161a I am rev [rev|4]
-  pick 652413bf663e I am rev [rev|5]
+  pick 177f92b77385 I am rev 2
+  pick 055a42cdd887 I am rev 3
+  pick e860deea161a I am rev 4
+  pick 652413bf663e I am rev 5
   
   # Edit history between 177f92b77385 and 652413bf663e
   #