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Pointed out that LeafToParent_Type was misused.

Some events are fired on each meta type detection, while we just handle
those events on a global change basis.
Qt has some similar deduplication for repaint() or touch events, but
does not provide it to user.

Close #6838

This is also used on *BSD systems.

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

Far too many clueless users push the volume far too high[1]. Then they
complain that VLC distorts the sound... Really anything above 100% (0dB)
is prone to saturation. In my experience, loss of quality is noticeable
at +6dB and unbearable at +10dB.

For the references:
In VLC 1.1, the UI was restricted to 200% (+6dB) by default,
while the audio output core allowed up to 400% (+12dB).
PulseAudio recommends +11dB.
Microsoft Windows limits to +0dB.

[1] I actually compared VLC 1.1, VLC 2.0 and WMP with an external
decibel metter. They give the same output at 0dB. At 6dB, both VLC
versions give the same decibel readings and slight distortion. So the
complaints are purely caused by confusion and cluelessness from users.

...and simplify accordingly.

Also fixes a mistake in 229c807c
where isCurrent == isSelected

int64_t is not supported natively by the Qt object system.