a-Inline Spectrogram used a ringbuffer to send mixed down audio data
from the DSP thread to the inline display thread. The problem is that
several inline display threads can coexist (one for the channel strip in
the editor, one for the channel strip in the mixer, and soon one for an
inline display in the generic plugin UI). A ringbuffer is single-writer
single-reader so each display only got part of the data, and all were
competing for it.
Replace it with a circular table, where the DSP sets a write pointer,
and every (inline display) user keeps its own read pointer and checks it
is not so far in the past as to be overtaken by the DSP write pointer.
* lock list when editing (prevent concurrent modification of insert
iterator
* don't add a guard-point if an event is already present between the
target and guard-point-position
* remove existing automation-events (old guard points) when
touching automation w/o change
* don't unset "new write pass" when not rolling
(fixes issues when not rolling but locating with write-enabled)
Editor::redisplay_tempo() is called early on, before
Editor::set_timecode_ruler_scale() and Editor::compute_bbt_ruler_scale ()
are called. That is a bug which needs fixing (initial tempo+grid display)
. Still, uninitialized vars are not good.
This calls for a unified API to invoke
Automatable methods ::transport_located() and ::transport_stopped()
on Stripables, rather than indirectly calling it via
Route::non_realtime_locate(), Route::nonrealtime_handle_transport_stopped()
Setting a tempo to 'Continue' via right click puts it in a permanent state
of continuing the previous section's end tempo (basically what
'Lock Continue' should have been). This can be disabled (unlocked) by
selecting 'Don't Continue'.
Remove the previous temporary 'Continue' function.
Reorganise menu to separate position lock style from more commonly
used functions.
It was assumed that the drag takes place within an area of musical time.
This is not true for the space before any non-initial
meter-locked tempo.
In the case of the initial tempo, there is no previous section
to perform an end-drag on.
If we've clicked on a tempo bar before the initial tempo,
don't allow anything to happen.
If it was just a click, ensure the tempo curve colour is restored.
