crecord: make _getstatuslines update numstatuslines

We are going to make the text in the status window dynamically generated,
so its size would be dynamic. Change getstatuslines to update
"numstatuslines" automatically. Fix an issue where "numstatuslines" being 1
makes the chunkpad disappear.

mercurial/crecord.py

@@ -541,7 +541,7 b' class curseschunkselector(object):'
         # keeps track of the number of lines in the pad
         self.numpadlines = None
 
-        self.numstatuslines = 2
+        self.numstatuslines = 1
 
         # keep a running count of the number of lines printed to the pad
         # (used for determining when the selected item begins/ends)
@@ -955,6 +955,9 b' class curseschunkselector(object):'
                        "(space/A) toggle hunk/all; (e)dit hunk;"),
                      _(" (f)old/unfold; (c)onfirm applied; (q)uit; (?) help "
                        "| [X]=hunk applied **=folded, toggle [a]mend mode")]
+        if len(lines) != self.numstatuslines:
+            self.numstatuslines = len(lines)
+            self.statuswin.resize(self.numstatuslines, self.xscreensize)
         return [util.ellipsis(l, self.xscreensize - 1) for l in lines]
 
     def updatescreen(self):
@@ -979,7 +982,7 b' class curseschunkselector(object):'
             self.updatescroll()
             self.chunkpad.refresh(self.firstlineofpadtoprint, 0,
                                   self.numstatuslines, 0,
-                                  self.yscreensize + 1 - self.numstatuslines,
+                                  self.yscreensize - self.numstatuslines,
                                   self.xscreensize)
         except curses.error:
             pass