smallstep (resp. largestep) is intended to be the interface delta
corresponding to a desc.smallstep (resp. largestep) in internal scale,
and is computed by incrementing from desc.lower.
But ac->internal_to_interface(desc.lower) isn't necessarily zero. In
fact it currently is 0.5 / (M - m + 1) for integer parameters where M is
the maximum and m is the minimum possible value since it is the center
of the [0,1/(M-m+1)] interval.
Since the lower bound of the delta isn't always zero, don't ignore it
when computing the actual increment.
This fixes various issues with integer controls (some values are not
reachable due to incorrect rounding in AutoSpin) and also pulls
in the various benefits of BarController:
* mouse-drags
* numeric entry
* alternative entry modes (piano-keyboard, tempo-based values)
If this style remains, ClickBox & AutoSpin should be removed from
the codebase.
Removing a Track does not delete its playlists and one can keep
Playlists after Cleanup. Don't crash if a the track that the playlist
originally belonged to does no longer exist.
Once a session has been saved by a more recent version or a different
variant, the session file is tied to that version/variant.
The created-with version is only for debug purposes and internal use.
Generated by tools/f2s. Some hand-editing will be required in a few places to fix up comments related to timecode
and video in order to keep the legible
Editor::hide_track_in_display() -> EditorRoutes::hide_track_in_display()
and ensuing calls to sync the treeview may modify the selection
(de-select hidden tracks) and invalidate selection->tracks
