Merge remote-tracking branch 'origin/MAGETWO-64644' into BUGS

Author: slavvka

app/code/Magento/Ui/view/base/web/js/form/components/fieldset.js

@@ -22,6 +22,7 @@ define([
             opened: false,
             level: 0,
             visible: true,
+            initializeFieldsetDataByDefault: false,    /* Data in some fieldsets should be initialized before open */
             disabled: false,
             listens: {
                 'opened': 'onVisibilityChange'

app/code/Magento/Ui/view/base/web/templates/form/fieldset.html

@@ -46,7 +46,7 @@
     <div class="admin__fieldset-wrapper-content"
          css="'admin__collapsible-content': collapsible, '_show': opened, '_hide': !opened()">
         <fieldset
-                if="opened() || _wasOpened"
+                if="opened() || _wasOpened || initializeFieldsetDataByDefault"
                 class="admin__fieldset"
                 each="data: elems, as: 'element'" render=""/>
     </div>