QmlDesigner: Allow priorities for resource handlers

Change-Id: If9e9ad3ebc57ba2d80f3b1e89d0643223a00fe72
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/qmldesigner/components/componentcore/designeractionmanager.h

@@ -49,16 +49,19 @@ struct AddResourceHandler
 public:
     AddResourceHandler( const QString &_category,
                         const QString &_filter,
-                        AddResourceOperation _operation)
+                        AddResourceOperation _operation,
+                        int _priority = 0)
         : category(_category)
         ,filter(_filter)
         ,operation(_operation)
+        ,piority(_priority)
     {
     }
 
     QString category;
     QString filter;
     AddResourceOperation operation;
+    int piority;
 };
 
 class DesignerActionToolBar : public Utils::StyledBar

src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp

@@ -37,6 +37,7 @@
 #include <rewritingexception.h>
 #include <qmldesignerplugin.h>
 
+#include <utils/algorithm.h>
 #include <utils/flowlayout.h>
 #include <utils/fileutils.h>
 #include <utils/stylehelper.h>
@@ -395,14 +396,26 @@ void ItemLibraryWidget::addResources()
     QTC_ASSERT(document, return);
 
     QList<AddResourceHandler> handlers = QmlDesignerPlugin::instance()->viewManager().designerActionManager().addResourceHandler();
+
     QMultiMap<QString, QString> map;
     for (const AddResourceHandler &handler : handlers) {
         map.insert(handler.category, handler.filter);
     }
 
+    QMap<QString, int> priorities;
+    for (const AddResourceHandler &handler : handlers) {
+        priorities.insert(handler.category, handler.piority);
+    }
+
+    QStringList sortedKeys = map.uniqueKeys();
+    Utils::sort(sortedKeys, [&priorities](const QString &first,
+                const QString &second){
+        return priorities.value(first) < priorities.value(second);
+    });
+
     QStringList filters;
 
-    for (const QString &key : map.uniqueKeys()) {
+    for (const QString &key : sortedKeys) {
         QString str = key + " (";
         str.append(map.values(key).join(" "));
         str.append(")");