Make sublayer dialog sortable and sort by layername initially. Patch …

…provided by Stefan Ziegler

src/gui/qgssublayersdialog.cpp

@@ -162,6 +162,9 @@ int QgsSublayersDialog::exec()
     return QDialog::Accepted;
   }
 
+  layersTable->sortByColumn( 1, Qt::AscendingOrder );
+  layersTable->setSortingEnabled( true );
+
   // if we got here, disable override cursor, open dialog and return result
   // TODO add override cursor where it is missing (e.g. when opening via "Add Raster")
   QCursor cursor;

src/ui/qgssublayersdialogbase.ui

@@ -28,6 +28,12 @@
      <property name="selectionBehavior">
       <enum>QAbstractItemView::SelectRows</enum>
      </property>
+     <property name="sortingEnabled">
+      <bool>false</bool>
+     </property>
+     <attribute name="headerShowSortIndicator" stdset="0">
+      <bool>true</bool>
+     </attribute>
      <column>
       <property name="text">
        <string>1</string>