Auto Scroll enhancement to Pager.c

[Guy L. Albertelli]

This fixes the problem with IE 4 where the Favorites dropdown menu would not
scroll up or down unless you pressed the button. Now it works more like the
native.

License:  LGPL

Changelog:
Guy Albertelli  <<galberte at neo.lrun.com>>

  dlls/comctl32/pager.c
   - Change traces to trace full window handle and
     improve some traces.
   - Send WM_NOTIFY to parent not to self.
   - Implement PGS_AUTOSCROLL via MOUSEMOVE and
     Timer routines.
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