progress: move cached debug flag from progress.progbar to scmutil.progress

It's simpler this way. One possible drawback (and a possisble
advantage) is that we now check the debug flag once per topic, so
processes that generate new topics all the time will still check the
flag frequently.

Differential Revision: https://phab.mercurial-scm.org/D5528

mercurial/progress.py

@@ -104,8 +104,6 b' class progbar(object):'
         self.order = self.ui.configlist('progress', 'format')
         self.estimateinterval = self.ui.configwith(
             float, 'progress', 'estimateinterval')
-        # developer config: progress.debug
-        self.debug = self.ui.configbool('progress', 'debug')
 
     def show(self, now, topic, pos, item, unit, total):
         if not shouldprint(self.ui):

mercurial/scmutil.py

@@ -1421,6 +1421,7 b' class progress(object):'
         self.topic = topic
         self.unit = unit
         self.total = total
+        self.debug = ui.configbool('progress', 'debug')
 
     def __enter__(self):
         return self
@@ -1458,14 +1459,7 b' class progress(object):'
             self.ui._progbar.progress(self.topic, self.pos, item=item,
                                       unit=self.unit, total=self.total)
 
-            # Looking up progress.debug in tight loops is expensive. The value
-            # is cached on the progbar object and we can avoid the lookup in
-            # the common case where a progbar is active.
-            if self.pos is None or not self.ui._progbar.debug:
-                return
-
-        # Keep this logic in sync with above.
-        if self.pos is None or not self.ui.configbool('progress', 'debug'):
+        if self.pos is None or not self.debug:
             return
 
         if self.unit: