Send Accessibility Change Notifications (surge-synthesizer#5631)

In a few strategic spots, if there's an accesibility handler
on the object, send accessibility notificatios for the object.

Addresses surge-synthesizer#4616

src/surge-xt/gui/SurgeGUIEditor.cpp

@@ -1892,6 +1892,10 @@ void SurgeGUIEditor::openOrRecreateEditor()
         patchSelector->grabKeyboardFocus();
     }
 
+    if (auto *handler = frame->getAccessibilityHandler())
+    {
+        handler->notifyAccessibilityEvent(juce::AccessibilityEvent::structureChanged);
+    }
     frame->repaint();
 }
 
@@ -6279,6 +6283,16 @@ void SurgeGUIEditor::addComponentWithTracking(juce::Component *target, juce::Com
     auto cf = containedComponents.find(&source);
     if (cf != containedComponents.end())
         containedComponents.erase(cf);
+
+    /* Place this accessibility invalidation here in either case */
+    if (auto *handler = source.getAccessibilityHandler())
+    {
+        if (handler->getValueInterface())
+        {
+            handler->notifyAccessibilityEvent(juce::AccessibilityEvent::valueChanged);
+        }
+        handler->notifyAccessibilityEvent(juce::AccessibilityEvent::titleChanged);
+    }
 }
 void SurgeGUIEditor::addAndMakeVisibleWithTracking(juce::Component *target, juce::Component &source)
 {

src/surge-xt/gui/widgets/WidgetBaseMixin.h

@@ -47,6 +47,11 @@ struct WidgetBaseMixin : public Surge::GUI::SkinConsumingComponent,
     {
         for (auto t : listeners)
             t->valueChanged(this);
+
+        if (auto *handler = asT()->getAccessibilityHandler(); handler->getValueInterface())
+        {
+            handler->notifyAccessibilityEvent(juce::AccessibilityEvent::valueChanged);
+        }
     }
     void notifyControlModifierClicked(const juce::ModifierKeys &k, bool addRMB = false)
     {