Update documentation and sip binding

Author: pblottiere

python/core/qgsvectorlayerjoininfo.sip

@@ -167,19 +167,35 @@ Returns whether values from the joined layer should be cached in memory to speed
 %End
 
     void setJoinFieldNamesBlackList( const QStringList &blackList );
+%Docstring
+ Sets a list of fields to ignore whatever happens.
+
+.. versionadded:: 3.0
+%End
 
     QStringList joinFieldNamesBlackList() const;
 %Docstring
+ Returns the list of fields to ignore.
+
+.. versionadded:: 3.0
  :rtype: list of str
 %End
 
     bool hasSubset( bool blacklisted = true ) const;
 %Docstring
+ Returns true if blacklisted fields is not empty or if a subset of names
+ has been set.
+
+.. versionadded:: 3.0
  :rtype: bool
 %End
 
     static QStringList joinFieldNamesSubset( const QgsVectorLayerJoinInfo &info, bool blacklisted = true );
 %Docstring
+ Returns the list of field names to use for joining considering
+ blacklisted fields and subset.
+
+.. versionadded:: 3.0
  :rtype: list of str
 %End
 

src/core/qgsproperty.h

@@ -105,6 +105,7 @@ class CORE_EXPORT QgsPropertyDefinition
       DataTypeBoolean,
     };
 
+    //! Indicates for which settings the property has been set
     enum Origin
     {
       Diagram,

src/core/qgsvectorlayerjoininfo.h

@@ -141,12 +141,34 @@ class CORE_EXPORT QgsVectorLayerJoinInfo
      */
     QgsFeature extractJoinedFeature( const QgsFeature &feature ) const;
 
+    /**
+     * Sets a list of fields to ignore whatever happens.
+     *
+     * \since QGIS 3.0
+     */
     void setJoinFieldNamesBlackList( const QStringList &blackList ) { mBlackList = blackList; }
 
+    /**
+     * Returns the list of fields to ignore.
+     *
+     * \since QGIS 3.0
+     */
     QStringList joinFieldNamesBlackList() const { return mBlackList; }
 
+    /**
+     * Returns true if blacklisted fields is not empty or if a subset of names
+     * has been set.
+     *
+     * \since QGIS 3.0
+     */
     bool hasSubset( bool blacklisted = true ) const;
 
+    /**
+     * Returns the list of field names to use for joining considering
+     * blacklisted fields and subset.
+     *
+     * \since QGIS 3.0
+     */
     static QStringList joinFieldNamesSubset( const QgsVectorLayerJoinInfo &info, bool blacklisted = true );
 
     bool operator==( const QgsVectorLayerJoinInfo &other ) const