Fixes for Toolbar

[Guy L. Albertelli]

Found these problems while trying to get IE4's "Favorites" menu item to
work. There are probably more cases yet to do.

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

   dlls/comctl32/toolbar.c
    - Recalc the toolbar size on TB_SETBUTTONSIZE in certain conditions.
    - Add trace to show the paint rectangle prior to refreshing.
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