Session::possible_states correctly filters files
and also directly returns sorted base-names.
We can remove the redundant `get_state_files_in_directory`
API now.
see also 193b35e885
Editor::motion_handler() only updates the snap-cursor
when no drags are active. While dragging, Drag::motion is
responsible to set the cursor accordingly.
In many cases the snap-cursor simply remained stuck at
the most recent position. Since in many cases
(e.g. RubberbandSelectDrag) it makes no sense to show the
cursor, so Drag::start_grab now hides the cursor by default.
This also fixes cases where the cursor is shown, but
was displayed in the wrong location.
Besides, it can happen under normal circumstances that the
Editor window, or any other window with clocks (prefs) is
visible while no session is loaded.
In rare cases DiskWriter::run() may call finish_capture()
concurrently with the butler thread from transport_stopped_wallclock,
this can lead to memory corruption (CaptureInfo).
Using a Mutex here is not great, but it is not usually contended
and better than crashing at rec-stop.
We should probably change DiskWrWiter::_was_recording into an
atomic bool, and use CAS to prevent concurrent calls.
A rec-region is added to the streamview just like any other region
(::add_region_view_internal). This subscribes to region->DropReferences.
When the DropReferences is handled first by StreamView::remove_region_view
the corresponding RegionView is destroyed.
This can happen even while recording is still active, eg. when locating
(which stops the current recording).
MidiStreamView::setup_rec_box() is called and crashes in
`dynamic_cast<MidiRegionView*> (rec_regions.back().second);`
due to a use after free.
Strictly speaking this is a logic error in how ::setup_rec_box()
determines if to add or remove the rec-box. But due to the
asynchronous nature of signal emission and transport-state changes
the best solution is to destroy the rec-region at the same
when the RegionView is destroyed.
To reproduce:
* create a session with a MIDI track
* disconnect the input (empty MIDI regions are removed)
* Preferences > Transport > *enable* latched-record-enable
* use the Dummy backend's MIDI generator
* connect Hardware > MIDI > MMC -> Ardour misc > MMC in
OR use JACK-transport to locate while recording.
The GUI was able to free memory (MidiTracer::disconnect),
while the tracer is concurrently still in use in rt-context.
This lead to memory corruption in MIDI::Parser::scanner.
This fixes undo/redo action sensitivity for non-editor
history stack changes.
Notably recording was not undoable, because the butler
thread creates the reversible "capture" command.
port-meta-data depends on the audioengine backend/device
settings. Those are only available after the engine is started,
not from within the backend's _start() method.
This is is only relevant for callback based backends.
Backends with a blocking process thread explicitly emit
port-manager callbacks there before entering the main loop.
Because those Widgets are added to managed frames (for search highlight)
the labels inside also need to be managed and not destroyed with the
Option (which happens first).
This fixes various GTK warnings at exit
```
gtk_widget_unparent: assertion 'GTK_IS_WIDGET (widget)' failed
```
Record, move recorded region(s), delete the recorded source, undo.
Undo would undo the region-move, of a region that no longer
exists and has no source.
