fix deadlock when updating audio/midi connection matrix
during session-close or on exit.
(Note: this still can cause a crash if the route goes away
while the iterator in the connection-matrix still has an index
of it)
- rework metric/tick image cache invalidation
- flush cache
- send signal to queue redraws
(TODO) selectively flush cache // cache per size, style
- add four common line up levels
* move color-regions-using-track color into UI config, not RC config
* consolidate all waveform coloring into AudioRegionView::set_one_waveform_color()
Mostly this just involved removing the private CacheEntry class that really served no further purpose once
the design reverted to a single cached image
note: the solution is non-obvious, but the obvious one of applying a translational Cairo::Matrix to the gradient
caused an exception to be thrown because of a non-invertible matrix.
Make download of sound files multi-threaded. Each sound file download takes
place in its own thread, and has its own progress bar and cancel button,
which stack up from the bottom of the list of results.
Sound files download into a file with a '.part' suffix, which is then
renamed to the intended name on success.
Add a 'Similar' button, which searches Freesound for sounds similar to the
currently-selected sound in the results list.
Add a freesound-download-dir config variable to decide the location
of sound files downloaded from Freesound.
Move Windows-specific logic to replace '/'s with '\'s from
Mootcher::changeWorkingDir() to Mootcher::ensureWorkingDir(), and remove
the now unused Mootcher::changeWorkingDir().
Use Glib::build_filename to construct paths.
Add constants for the keyboard modifiers that should be used for vertical
zoom, horizontal zoom, and horizontal scrolling in the main editor window,
and use these where appropriate rather than using Keyboard::PrimaryModifier
and friends directly.
