configitems: register the 'progress.estimate' config

mercurial/configitems.py

@@ -152,6 +152,9 b" coreconfigitem('progress', 'assume-tty',"
 coreconfigitem('progress', 'clear-complete',
     default=True,
 )
+coreconfigitem('progress', 'estimate',
+    default=2,
+)
 coreconfigitem('server', 'bundle1',
     default=True,
 )

mercurial/progress.py

@@ -217,7 +217,7 b' class progbar(object):'
             elapsed = now - self.starttimes[topic]
             # experimental config: progress.estimate
             if elapsed > float(
-                self.ui.config('progress', 'estimate', default=2)):
+                self.ui.config('progress', 'estimate')):
                 seconds = (elapsed * (target - delta)) // delta + 1
                 return fmtremaining(seconds)
         return ''
@@ -227,7 +227,7 b' class progbar(object):'
         delta = pos - initialpos
         elapsed = now - self.starttimes[topic]
         if elapsed > float(
-            self.ui.config('progress', 'estimate', default=2)):
+            self.ui.config('progress', 'estimate')):
             return _('%d %s/sec') % (delta / elapsed, unit)
         return ''