Fix lv2 parameter groups for a few more plugins

source/frontend/widgets/collapsablewidget.py

@@ -36,7 +36,7 @@ class CollapsibleBox(QGroupBox):
         self.toggle_button.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Preferred)
         self.toggle_button.setStyleSheet("border: none;")
         self.toggle_button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
-        self.toggle_button.setArrowType(Qt.RightArrow)
+        self.toggle_button.setArrowType(Qt.DownArrow)
         self.toggle_button.toggled.connect(self.toolButtonPressed)
 
         self.content_area   = QWidget(self)
@@ -53,7 +53,7 @@ class CollapsibleBox(QGroupBox):
     @pyqtSlot(bool)
     def toolButtonPressed(self, toggled):
         self.content_area.setVisible(toggled)
-        self.toggle_button.setArrowType(Qt.RightArrow if toggled else Qt.DownArrow)
+        self.toggle_button.setArrowType(Qt.DownArrow if toggled else Qt.RightArrow)
 
     def getContentLayout(self):
         return self.content_layout

source/utils/CarlaLv2Utils.hpp

@@ -2555,6 +2555,13 @@ const LV2_RDF_Descriptor* lv2_rdf_new(const LV2_URI uri, const bool loadPresets)
                 portGroup.Name = carla_strdup_safe(lilv_node_as_string(portGroupNameNode));
                 lilv_node_free(portGroupNameNode);
             }
+            // some plugins use rdfs:label, spec was not clear which one to use
+            else if (LilvNode* const portGroupLabelNode = lilv_world_get(lv2World.me, portGroupNode,
+                                                                        lv2World.rdfs_label.me, nullptr))
+            {
+                portGroup.Name = carla_strdup_safe(lilv_node_as_string(portGroupLabelNode));
+                lilv_node_free(portGroupLabelNode);
+            }
 
             if (LilvNode* const portGroupSymbolNode = lilv_world_get(lv2World.me, portGroupNode,
                                                                      lv2World.lv2_symbol.me, nullptr))