DemoRunner: Fix a crash in MidiDemo

examples/Audio/MidiDemo.h

@@ -247,10 +247,11 @@ private:
         MidiDeviceListBox (const String& name,
                            MidiDemo& contentComponent,
                            bool isInputDeviceList)
-            : ListBox (name, this),
+            : ListBox (name),
               parent (contentComponent),
               isInput (isInputDeviceList)
         {
+            setModel (this);
             setOutlineThickness (1);
             setMultipleSelectionEnabled (true);
             setClickingTogglesRowSelection (true);

modules/juce_gui_basics/widgets/juce_ListBox.cpp

@@ -350,6 +350,7 @@ public:
         auto newY = content.getY();
         auto newW = jmax (owner.minimumRowWidth, getMaximumVisibleWidth());
         auto newH = owner.totalItems * owner.getRowHeight();
+        DBG (owner.totalItems);
 
         if (newY + newH < getMaximumVisibleHeight() && newH > getMaximumVisibleHeight())
             newY = getMaximumVisibleHeight() - newH;