Const getter and api break docs

doc/api_break.dox

@@ -557,6 +557,15 @@ QgsBrowserModel        {#qgis_api_break_3_0_QgsBrowserModel}
 
 - addFavouriteDirectory has been renamed to addFavoriteDirectory
 - removeFavourite has been renamed to removeFavorite
+- initialize  has been added
+- initialized has been added
+
+
+QgsBrowserDockWidget    {#qgis_api_break_3_0_QgsBrowserDockWidget}
+--------------------
+
+- The constructor for QgsBrowserDockWidget has changed: a QgsBrowserModel instance is now an argument.
+
 
 QgsCachedFeatureIterator        {#qgis_api_break_3_0_QgsQgsCachedFeatureIterator}
 ------------------------

python/core/qgsbrowsermodel.sip

@@ -177,7 +177,7 @@ Reload the whole model
 Hide the given path in the browser model
 %End
 
-    bool initialized( );
+    bool initialized( ) const;
 %Docstring
 Returns true if the model has been initialized
  :rtype: bool

src/core/qgsbrowsermodel.h

@@ -168,7 +168,7 @@ class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
     void hidePath( QgsDataItem *item );
 
     //! Returns true if the model has been initialized
-    bool initialized( ) { return mInitialized;  }
+    bool initialized( ) const { return mInitialized;  }
 
     //! Delayed initialization, needed because the provider registry must be already populated
     void initialize();