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To remove, just drag n drop to the void.
To change, just drag n drop to new position.

 This will force people to use VLC_INPUT_OPTION_TRUSTED flag when they
need it and ease security review.
 This commit has no functionnal/security changes.

(But, what is the use of that cancel anyway?)

I used customEvent to implement it.
(It renders the dedicated message thread per subscriber useless with qt4).

As pointed out by Laurent, cancellation was not safe here

Some interfaces may assert because of missing playlist lock.

This remove the update() calls from within the bookmark dialog, since the update() is triggered from the core.
This needs more testing.

The code seems to be in a better shape now, and removes duplicates calls.
However: there seems to be a few issues left:
 - If you open the MediaInfo Dialog before an input, it doesn't fill after
 - If you stop, the MediaInfo doesn't clean itself.

First, assume that the core is correct now (not sure)
Then, rename a few functions and simplify the cases.

NOTA BENE, any commit on MediaInfo or Art needs to be reviewed before commiting.
NB2: any function named update() is forbidden in new commits in Qt code, thanks.

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

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

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

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

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

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

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