* doc/MaintGeom.3: Noted that Tk_MaintainGeometry handles direct

descendants properly.

* generic/tkGeometry.c (Tk_MaintainGeometry): Added a check for
the case in which the slave window is a direct descendant of the
master window.  In this case, we need not set up the additional
infrastructure normally provide by Tk_MaintainGeometry, because we
can rely on the parent/child relationship to handle it for us
implicitly.  In this case, Tk_MaintainGeometry just calls directly
to Tk_MoveResizeWindow.  This allows geometry managers to simply
always use Tk_MaintainGeometry to maintain geometry for slaves,
and avoid doing the direct descendant check themselves.
(Tk_UnmaintainGeometry): Added a matching check for the direct
descendant case; in this case, Tk_UnmaintainGeometry simply
returns immediately.

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