Set currentItem to NULL if there aren't anything playing on rebuild()

Maybe this would actually works better if we store index, but maybe I'll
look it sometime later why it didn't work as I expected.

X does it automatically when the connection is closed

Deeper code can cope with too overly large values.
We need to accept seemingly too far start times because the length is
typically not known at startup (and hence set to zero).

Internal counter is still int due to tab macros.

...to return a string representation of one specific or all vlm media, in a standardized JSON format.
The patch has been updated according to Rémi Denis-Courmont's and fenrir's comments.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

This reverts commit 753731a2.

Didn't afterall worked correctly even thought I thought I tested it.

restore setWindowState and setParent order

    - preserve apect ratio
    - alignment set to Center
    - signal-slot connection moved to a better place
    - Art updated in info Panel when artUrl is file://

The bug originates from an implicit conversion to int. This commit
explicitly convert the value to qreal then use qRound to take the nearest
integer.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>