This method did not do what its name suggested. Replace it with
::absolute_time_to_source_beats() which already existed and
computed the same result.
Also in a NoteCreateDrag, correctly adjust note start
depending on whether we are viewing the whole source or
just the region. This part may be amended later.
Previously this was semi-random, on_size_request() may be called
in response to some other widget changing size, before a given
ArdourButton DPIReset handler could set _diameter = 0.
Numerous bindings shared across EditingContexts are attached to the viewport for the canvas; unless
we begin with the canvas and walk up the the widget tree, we will never find them.
* Fix copy/edit bug: `get_last_capture_sources` cleared
last capture sources. tagging a take made its removal
impossible.
* `remove_last_capture` also directly modified capture
sources by reference in calling thread.
* get_ prefix violates styleguide #12
This prevents accidental deletes of files saved to disk
after the fact. e.g.
* save, delete last capture, quit w/o save.
* save, switch-snapshot, delete last capture.
This forces the length of AudioRegions to be an integer number of samples. It is intended
to fix a set of bugs that occur when using music time as the session time domain
and carrying out editing operations that would otherwise lead to audio regions
whose length involves fractional samples.
It is perfectly legal to specific audio distances that include fractional samples,
but there is no reason for any audio region to ever have such a length (we think).
Quantizing superclocks to samples in libtemporal negates the whole purpose of superclocks,
and breaks a variety of things, not limited to moving forward to markers and the grid
extern here is literally C `extern`, not DLL exported functions,
see libs/tk/ztk/ztk/atkversion.h
```
#ifndef _ATK_EXTERN
#define _ATK_EXTERN extern
#endif
```
