Use xcb to create and manage the X11 backend of Outline. In addition the
used background pixmaps are rendered with XRender instead of using a
QPainter on a QPixmap. This is done because QPixmap is no longer bound to
an X Pixmap.
To create the XRender Picture the available functionality from
kwinxrenderutils is used. To be able to use it in KWin core the compile
option to build without XRender is removed for kwinxrenderutils, but
still supported for effects.
Obviously the port to XCB is not complete as xremderutils itself is still
on XLib.
REVIEW: 108642
Unless the mouse pointer is not next to an electric border kwin calls
Outline::hide() on every move/resize event. To avoid unnecessary
repaints we now check whether the outline has been visible or not.
This change unduplicates some code and merges it into one class
allowing us to use an replacement effect for the outline in
future.
CCMAIL: a.arlt@stud.uni-heidelberg.de
REVIEW: 100848
