Updated editor material component slots to support dynamic previews rendered with property overrides applied

Fixed scaling issues with labels used for images
Reduced updating previews and material component inspector to only apply after a value is committed
Storing cache of previously rendered material previews

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialComponent.cpp

@@ -148,11 +148,13 @@ namespace AZ
             BaseClass::Activate();
             MaterialReceiverNotificationBus::Handler::BusConnect(GetEntityId());
             MaterialComponentNotificationBus::Handler::BusConnect(GetEntityId());
+            EditorMaterialSystemComponentNotificationBus::Handler::BusConnect();
             UpdateMaterialSlots();
         }
 
         void EditorMaterialComponent::Deactivate()
         {
+            EditorMaterialSystemComponentNotificationBus::Handler::BusDisconnect();
             MaterialReceiverNotificationBus::Handler::BusDisconnect();
             MaterialComponentNotificationBus::Handler::BusDisconnect();
             BaseClass::Deactivate();
@@ -260,6 +262,18 @@ namespace AZ
             }
         }
 
+        void EditorMaterialComponent::OnRenderMaterialPreviewComplete(
+            [[maybe_unused]] const AZ::EntityId& entityId,
+            [[maybe_unused]] const AZ::Render::MaterialAssignmentId& materialAssignmentId,
+            [[maybe_unused]] const QPixmap& pixmap)
+        {
+            if (entityId == GetEntityId())
+            {
+                AzToolsFramework::ToolsApplicationEvents::Bus::Broadcast(
+                    &AzToolsFramework::ToolsApplicationEvents::InvalidatePropertyDisplay, AzToolsFramework::Refresh_AttributesAndValues);
+            }
+        }
+
         AZ::u32 EditorMaterialComponent::OnConfigurationChanged()
         {
             return AZ::Edit::PropertyRefreshLevels::AttributesAndValues;