Make plug-in scanning faster

by preventing to load all kinds of stuff when scanning plug-in

main/src/infrastructure/plugin/realearn_plugin.rs

@@ -218,13 +218,19 @@ impl Plugin for RealearnPlugin {
 
     fn init(&mut self) {
         firewall(|| {
+            if self.reaper_is_scanning_plugins() {
+                return;
+            }
             self._reaper_guard = Some(self.ensure_reaper_setup());
             self.schedule_session_creation();
         });
     }
 
     fn get_editor(&mut self) -> Option<Box<dyn Editor>> {
         firewall(|| {
+            if self.reaper_is_scanning_plugins() {
+                return None;
+            }
             let boxed: Box<dyn Editor> = Box::new(RealearnEditor::new(self.main_panel.clone()));
             Some(boxed)
         })
@@ -355,6 +361,13 @@ impl Plugin for RealearnPlugin {
 }
 
 impl RealearnPlugin {
+    fn reaper_is_scanning_plugins(&self) -> bool {
+        // REAPER uses version "0" to indicate that this is only the plug-in scanning
+        // process.
+        let (version, _, _) = self.host.get_info();
+        version == 0
+    }
+
     /// Should be called in real-time thread only.
     fn is_now_playing(&self) -> bool {
         use vst::api::TimeInfoFlags;

main/src/infrastructure/plugin/realearn_plugin_parameters.rs

@@ -148,12 +148,6 @@ impl RealearnPluginParameters {
     }
 }
 
-impl Drop for RealearnPluginParameters {
-    fn drop(&mut self) {
-        debug!(Reaper::get().logger(), "Dropping plug-in parameters...");
-    }
-}
-
 /// This will be returned if ReaLearn cannot return reasonable bank data yet.
 const NOT_READY_YET: &str = "not-ready-yet";
 

main/src/infrastructure/ui/main_panel.rs

@@ -573,9 +573,3 @@ impl SessionUi for Weak<MainPanel> {
 fn upgrade_panel(panel: &Weak<MainPanel>) -> Rc<MainPanel> {
     panel.upgrade().expect("main panel not existing anymore")
 }
-
-impl Drop for MainPanel {
-    fn drop(&mut self) {
-        debug!(Reaper::get().logger(), "Dropping main panel...");
-    }
-}