Prefer to run calf fluidsynth as bridge, requires instance access

source/backend/engine/CarlaEngine.cpp

@@ -426,6 +426,8 @@ bool CarlaEngine::addPlugin(const BinaryType btype, const PluginType ptype,
         {
             if (std::strcmp(label, "http://calf.sourceforge.net/plugins/Analyzer") == 0)
                 preferBridges = true;
+            if (std::strcmp(label, "http://calf.sourceforge.net/plugins/Fluidsynth") == 0)
+                preferBridges = true;
             if (std::strcmp(label, "http://factorial.hu/plugins/lv2/ir") == 0)
                 preferBridges = true;
         }

source/backend/plugin/CarlaPluginLV2.cpp

@@ -4259,7 +4259,7 @@ public:
         const std::string    s_uri(uri);
         const std::ptrdiff_t s_pos(std::find(fCustomURIDs.begin(), fCustomURIDs.end(), s_uri) - fCustomURIDs.begin());
 
-        if (s_pos <= 0 || s_pos >= UINT32_MAX)
+        if (s_pos <= 0 || s_pos >= INT32_MAX)
             return CARLA_URI_MAP_ID_NULL;
 
         const LV2_URID urid     = static_cast<LV2_URID>(s_pos);

source/bridges-ui/CarlaBridgeUI-LV2.cpp

@@ -648,7 +648,7 @@ public:
         const std::string    s_uri(uri);
         const std::ptrdiff_t s_pos(std::find(fCustomURIDs.begin(), fCustomURIDs.end(), s_uri) - fCustomURIDs.begin());
 
-        if (s_pos <= 0 || s_pos >= UINT32_MAX)
+        if (s_pos <= 0 || s_pos >= INT32_MAX)
             return CARLA_URI_MAP_ID_NULL;
 
         const LV2_URID urid     = static_cast<LV2_URID>(s_pos);