... So that even if the time is "slightly" (less than 1/2 sample interval) left
of the discontinuity, the right-hand limit is always used.
Thus this compensates for some roundoff errors when pasting one clip with
an envelope into another.
This overcomes the objections that were in a comment in Envelope::Paste
to making control points with exactly equal times.
And therefore Paste can be rewritten to do so, but that has not happened yet.
Envelope points at exactly equal time coordinates can already be made by
dragging points in the envelope editor.
... that is, push a state only at button-up.
The undo during each drag increment didn't actually happen, because of a check
in OnUndo whether there is a drag in progress!
But this is not necessary to fix the excessive number of undo items, because
commit 63ae687baf already did that by other means.
It only removes an unusual usage.
That is, don't assume uniformity of pixels per second, but supply the correct
first argument.
This will matter when there is a magnifier. But that will not be in the next
version.
This reintroduces the buttons to toggle display of individual midi
channels, and cleans up the code behind that feature.
This functionality has actually been present in production versions of
audacity for a while, at least for clicking. However, the buttons
themselves were not drawn, making it exteremly painful (but possible) to
use.
As requested by PRL, this is always enabled if USE_MIDI is defined.
Clip Left
Clip Right
If the cursor lies within a clip, the clip and the cursor is moved 1 pixel left/right.
If the cursor position is at both a clip end and a clip start, the second of these clips is moved.
The movement currently ignores the snap to setting on the selection bar, and there is no snapping to the clip boundaries of other clips.
Following the behaviour or shifting with the mouse, the distance moved is rounded to an integral number of samples, and the minimum distance moved is one sample.
This gets rid of the offset rectangle hack that was needed to re-use gain
sliders for note track velocities. It also removes the need for changing
the style of a single slider. Perhaps most importantly, it fixes link
errors regarding GainSlider(int).
See https://sourceforge.net/p/audacity/mailman/message/35752524/ for
details on why this change is needed and what caused it.
"Velocity" is the technical term, and it's the term that's used everywhere.
"Gain" was probably only used because "gain" is used on wave tracks; since
note tracks aren't wave tracks (and shouldn't be treated as them) the
corresponding variables should be named velocity.
When the menu key is pressed, mouse events are also generated, and one of these was interpreted as a mouse click outside the tracks, which deselected the tracks.
A possible fix would have been to make a change in TrackPanel::HandleTrackSpecificMouseEvent() so that only left clicks outside of tracks would deselect tracks.
However, I decided that a better fix was to modify TrackPanel::OnMouseEvent to ignore the mouse events generated when the menu key is pressed. This should prevent these mouse events from causing bugs in any new code.
