diff --git a/mercurial/crecord.py b/mercurial/crecord.py
--- a/mercurial/crecord.py
+++ b/mercurial/crecord.py
@@ -534,8 +534,6 @@
     if util.safehasattr(signal, 'SIGTSTP'):
         origsigtstp = signal.getsignal(signal.SIGTSTP)
     try:
-        import pdb
-        pdb.set_trace()
         curses.wrapper(chunkselector.main)
         if chunkselector.initexc is not None:
             raise chunkselector.initexc
@@ -1765,6 +1763,12 @@
         except curses.error:
             self.usecolor = False
 
+        # In some situations we may have some cruft left on the "alternate
+        # screen" from another program (or previous iterations of ourself), and
+        # we won't clear it if the scroll region is small enough to comfortably
+        # fit on the terminal.
+        self.stdscr.clear()
+
         # available colors: black, blue, cyan, green, magenta, white, yellow
         # init_pair(color_id, foreground_color, background_color)
         self.initcolorpair(None, None, name="normal")