Files
lmms/include
Michael Gregorius 4a720cb3e5 Move the fader of the selected channel
Move the fader of the selected channel instead of the fader that has
focus when the up/plus or down/minus keys are pressed. Doing so also
feels more natural because users can already change the selected
channel via the left and right keys and now they can immediately adjust
the volume of the currently selected channel while doing so.

Key events are now handled in `MixerView::keyPressEvent` instead of
`Fader::keyPressEvent` and the latter is removed. `MixerChannelView`
now has a method called `fader` which provides the associated fader.
This is needed so that the event handler of `MixerView` can act upon
the currently selected fader.

## Changes in Fader
The `Fader` class provides two new public methods.

The `adjust` method takes the modifier key(s) and the adjustment
direction and then decides internally how the modifier keys are mapped
to increment values. This is done to keep the mapping between modifier
keys and increment values consistent across different clients, e.g. the
key event of the `MixerView` and the wheel event of the `Fader` itself.
The direction is provided by the client because the means to determine
the direction can differ between clients and cases, e.g. a wheel event
determines the direction differently than a key event does.

The method `adjustByDecibelDelta` simply adjusts the fader by the given
delta amount. It currently is not really used in a public way but it
still makes sense to provide this functionality in case a parent class
or client wants to manipulate the faders by its very own logic.

Because the `Fader` class does not react itself to key press events
anymore the call to `setFocusPolicy` is removed again.
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