ATOM-14003 adding image thumbnails to material inspector properties

https://jira.agscollab.com/browse/ATOM-14003

Code/Framework/AzToolsFramework/AzToolsFramework/UI/PropertyEditor/PropertyAssetCtrl.cpp

@@ -1304,7 +1304,11 @@ namespace AzToolsFramework
         }
         else if (attrib == AZ_CRC_CE("Thumbnail"))
         {
-            GUI->SetShowThumbnail(true);
+            bool showThumbnail = false;
+            if (attrValue->Read<bool>(showThumbnail))
+            {
+                GUI->SetShowThumbnail(showThumbnail);
+            }
         }
         else if (attrib == AZ_CRC_CE("ThumbnailCallback"))
         {

Code/Framework/AzToolsFramework/AzToolsFramework/UI/PropertyEditor/ThumbnailPropertyCtrl.cpp

@@ -114,6 +114,7 @@ namespace AzToolsFramework
             m_thumbnailEnlarged->move(position);
             m_thumbnailEnlarged->setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
             m_thumbnailEnlarged->SetThumbnailKey(m_key);
+            m_thumbnailEnlarged->raise();
             m_thumbnailEnlarged->show();
         }
         QWidget::enterEvent(e);