Feat: more predictable projet load behavior

src/app.rs

@@ -527,10 +527,15 @@ impl App {
         self.load_step_to_editor();
     }
 
-    pub fn save(&mut self, path: PathBuf, link: &LinkState) {
+    pub fn save(&mut self, path: PathBuf, link: &LinkState, snapshot: &SequencerSnapshot) {
         self.save_editor_to_step();
         self.project_state.project.sample_paths = self.audio.config.sample_paths.clone();
         self.project_state.project.tempo = link.tempo();
+        self.project_state.project.playing_patterns = snapshot
+            .active_patterns
+            .iter()
+            .map(|p| (p.bank, p.pattern))
+            .collect();
         match model::save(&self.project_state.project, &path) {
             Ok(final_path) => {
                 self.ui
@@ -547,12 +552,27 @@ impl App {
         match model::load(&path) {
             Ok(project) => {
                 let tempo = project.tempo;
+                let playing = project.playing_patterns.clone();
+
                 self.project_state.project = project;
                 self.editor_ctx.step = 0;
                 self.load_step_to_editor();
                 self.compile_all_steps(link);
                 self.mark_all_patterns_dirty();
                 link.set_tempo(tempo);
+
+                self.playback.clear_queues();
+                self.variables.lock().unwrap().clear();
+                self.dict.lock().unwrap().clear();
+
+                for (bank, pattern) in playing {
+                    self.playback.queued_changes.push(StagedChange {
+                        change: PatternChange::Start { bank, pattern },
+                        quantization: crate::model::LaunchQuantization::Immediate,
+                        sync_mode: crate::model::SyncMode::Reset,
+                    });
+                }
+
                 self.ui.set_status(format!("Loaded: {}", path.display()));
                 self.project_state.file_path = Some(path);
             }
@@ -1103,7 +1123,7 @@ impl App {
                 }
                 self.project_state.mark_dirty(bank, pattern);
             }
-            AppCommand::Save(path) => self.save(path, link),
+            AppCommand::Save(path) => self.save(path, link, snapshot),
             AppCommand::Load(path) => self.load(path, link),
 
             // UI