fix: Fix Loading shared layout and site portlets - Meeds-io/meeds#2274 (

#932)

Prior to this change, when the loaded page is using hideSharedLayout
flag, the shared layout CSS resources are loaded. This change makes sure
to avoid loading CSS Resources of portlets only when needed and
displayed.

webui/src/main/java/org/exoplatform/portal/webui/workspace/UIPortalApplication.java

@@ -649,7 +649,13 @@ public void setSkin(String skin) {
     public Set<Skin> getPortletSkins() {
         // Determine portlets visible on the page
         List<UIPortlet> uiportlets = new ArrayList<>();
-        uiWorkingWorkspace.findComponentOfType(uiportlets, UIPortlet.class);
+        getCurrentPage().findComponentOfType(uiportlets, UIPortlet.class);
+        if (!PortalRequestContext.getCurrentInstance().isMaximizePortlet()) {
+          getCurrentSite().findComponentOfType(uiportlets, UIPortlet.class);
+        }
+        if (!PortalRequestContext.getCurrentInstance().isHideSharedLayout()) {
+          uiWorkingWorkspace.findComponentOfType(uiportlets, UIPortlet.class);
+        }
         List<Skin> portletSkins = new ArrayList<>();
         Set<SkinConfig> portalPortletSkins = getPortalPortletSkins();
         // don't merge portlet if portlet not available