(partial, as this won't work on Leopard without a few further changes)

We should probably exit anyway, as it should be a bug...

We must not send PAUSE if already in pause, when seeking (it would
unpause the stream). And DEMUX_SET_PAUSE_STATE should do nothing if
pause state is already what we want.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

should fix that returning from fullscreen going wrongsize, also set
fullscreen flags after reparent and before parenting back from
fullscreen.

screennumbers starts from 1 onward, this allows user again to define if
he wants fullscreen window on particular screen instead of the one where
interface is.

configure: Add implicit sequence-point return-type strict-aliasing array-bounds missing-parameter-type overflow int-to-pointer-cast pointer-to-int-cast div-by-zero overflow to the list of Werror warnings.

Signed-off-by: Pierre d'Herbemont <pdherbemont@free.fr>

Added some additional locking to the media list player playitem functions to prevent threading instability.
Signed-off-by: Pierre d'Herbemont <pdherbemont@free.fr>