Only parse additional Session midnam files on Session load

When loading a Session add the Session patchfiles directory to the
MidiPatchManager search path and only process/parse the files for that
directory rather than refreshing/reparsing all the files. Similarly for unload,
just unload the devices that are from the Session specific midnam files instead
of removing the path and refreshing/reparsing all the files.

This will not remove the "system" midnam files as they are always added first
and duplicates from the session patchfiles directory are ignored.

1 files changed, 4 insertions, 2 deletions

diff --git a/libs/ardour/ardour/midi_patch_manager.h b/libs/ardour/ardour/midi_patch_manager.h
index c7154c49a6..3c10a3a149 100644
--- a/libs/ardour/ardour/midi_patch_manager.h
+++ b/libs/ardour/ardour/midi_patch_manager.h
@@ -139,9 +139,11 @@ public:
 	const DeviceNamesByMaker& devices_by_manufacturer() const { return _devices_by_manufacturer; }
 
 private:
-	void refresh();
-
 	bool add_midi_name_document(const std::string& file_path);
+	bool remove_midi_name_document(const std::string& file_path);
+
+	void add_midnam_files_from_directory(const std::string& directory_path);
+	void remove_midnam_files_from_directory(const std::string& directory_path);
 
 private:
 	PBD::Searchpath                         _search_path;