[Comctl32] Fix tab control

[Maxime Bellengé]

When you have a one row tab component with two tabs for instance and you
put another control like a button just right after the last tab on the
area of the tab component, the button is erased by the painting of the
tab whereas on windows it is not. this patch fixes that. That behavior
and be seen on a real application : eMule.

ChangeLog:
   * Only redraw the necessary area of the tab component and not the
whole component like windows does.

-- 
Maxime Bellengé <maxime.bellenge at laposte.net>
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