Accessibility: Avoid allowing TextEditor and Viewport internal components to be accessibility-focused

The TextHolderComponent and Viewport::componentHolder don't have any
accessible semantics, so they shouldn't be included in the accessible
component hierarchy.

modules/juce_gui_basics/layout/juce_Viewport.h

@@ -337,8 +337,16 @@ protected:
 
 private:
     //==============================================================================
+    class AccessibilityIgnoredComponent : public Component
+    {
+        std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
+        {
+            return createIgnoredAccessibilityHandler (*this);
+        }
+    };
+
     std::unique_ptr<ScrollBar> verticalScrollBar, horizontalScrollBar;
-    Component contentHolder;
+    AccessibilityIgnoredComponent contentHolder;
     WeakReference<Component> contentComp;
     Rectangle<int> lastVisibleArea;
     int scrollBarThickness = 0;

modules/juce_gui_basics/widgets/juce_TextEditor.cpp

@@ -868,6 +868,12 @@ struct TextEditor::TextHolderComponent  : public Component,
 
     TextEditor& owner;
 
+private:
+    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
+    {
+        return createIgnoredAccessibilityHandler (*this);
+    }
+
     JUCE_DECLARE_NON_COPYABLE (TextHolderComponent)
 };
 
@@ -894,6 +900,11 @@ struct TextEditor::TextEditorViewport  : public Viewport
     }
 
 private:
+    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
+    {
+        return createIgnoredAccessibilityHandler (*this);
+    }
+
     TextEditor& owner;
     int lastWordWrapWidth = 0;
     bool reentrant = false;