Don't save lv2 keys not registered by the plugin

distrho/src/DistrhoPluginInternal.hpp

@@ -258,6 +258,17 @@ public:
 #endif
 
 #if DISTRHO_PLUGIN_WANT_STATE
+    bool wantsStateKey(const char* const key) const noexcept
+    {
+        for (uint32_t i=0; i < fData->stateCount; ++i)
+        {
+            if (fData->stateKeys[i] == key)
+                return true;
+        }
+
+        return false;
+    }
+
     uint32_t getStateCount() const noexcept
     {
         return fData != nullptr ? fData->stateCount : 0;

distrho/src/DistrhoPluginLV2.cpp

@@ -644,6 +644,10 @@ private:
     {
         fPlugin.setState(key, newValue);
 
+        // check if we want to save this key
+        if (! fPlugin.wantsStateKey(key))
+            return;
+
         // check if key already exists
         for (auto it = fStateMap.begin(), end = fStateMap.end(); it != end; ++it)
         {
@@ -656,7 +660,7 @@ private:
             }
         }
 
-        // add a new one then
+        // nope, add a new one then
         d_string d_key(key);
         fStateMap[d_key] = newValue;
     }