Some sip changes and doxymentation

python/core/qgseditformconfig.sip

@@ -57,7 +57,6 @@ class QgsEditFormConfig : QObject
       SuppressOff = 2      //!< Do not suppress feature form
     };
 
-    explicit QgsEditFormConfig( QObject* parent = nullptr );
 
     /**
      * This is only useful in combination with EditorLayout::TabLayout.

python/core/qgsvectorlayer.sip

@@ -1098,6 +1098,15 @@ class QgsVectorLayer : QgsMapLayer
      * Returns a list of tabs holding groups and fields
      */
     QList< QgsAttributeEditorElement* > attributeEditorElements();
+
+    /**
+     * Get the configuration of the form used to represent this vector layer.
+     * This is a writable configuration that can directly be changed in place.
+     *
+     * @return The configuration of this layers' form
+     */
+    QgsEditFormConfig* editFormConfig() const;
+
     /**
      * Clears all the tabs for the attribute editor form
      */

src/core/qgseditformconfig.h

@@ -308,8 +308,6 @@ class CORE_EXPORT QgsEditFormConfig : public QObject
       SuppressOff = 2      //!< Do not suppress feature form
     };
 
-    explicit QgsEditFormConfig( QObject* parent = nullptr );
-
     /**
      * This is only useful in combination with EditorLayout::TabLayout.
      *
@@ -522,10 +520,16 @@ class CORE_EXPORT QgsEditFormConfig : public QObject
   private slots:
     void onRelationsLoaded();
 
-  private:
-
+  protected:
     // Internal stuff
 
+    /**
+     * Create a new edit form config. Normally invoked by QgsVectorLayer
+     */
+    explicit QgsEditFormConfig( QObject* parent = nullptr );
+
+  private:
+
     /**
      * Used internally to set the fields when they change.
      * This should only be called from QgsVectorLayer for synchronization reasons

src/core/qgsrulebasedlabeling.h

@@ -37,9 +37,36 @@ class CORE_EXPORT QgsRuleBasedLabeling : public QgsAbstractVectorLayerLabeling
           Registered    //!< Something was registered
         };
 
+        /**
+         * Get the labeling settings. May return a null pointer.
+         */
         QgsPalLayerSettings* settings() const { return mSettings; }
+
+        /**
+         * Determines if scale based labeling is active
+         *
+         * @return True if scale based labeling is active
+         */
         bool dependsOnScale() const { return mScaleMinDenom != 0 || mScaleMaxDenom != 0; }
+
+        /**
+         * The minimum scale at which this label rule should be applied
+         *
+         * E.g. Denominator 1000 is a scale of 1:1000, where a rule with minimum denominator
+         * of 900 will not be applied while a rule with 2000 will be applied.
+         *
+         * @return The minimum scale denominator
+         */
         int scaleMinDenom() const { return mScaleMinDenom; }
+
+        /**
+         * The maximum scale denominator at which this label rule should be applied
+         *
+         * E.g. Denominator 1000 is a scale of 1:1000, where a rule with maximum denominator
+         * of 900 will be applied while a rule with 2000 will not be applied.
+         *
+         * @return The maximum scale denominator
+         */
         int scaleMaxDenom() const { return mScaleMaxDenom; }
         /**
          * A filter that will check if this rule applies
@@ -186,6 +213,9 @@ class CORE_EXPORT QgsRuleBasedLabeling : public QgsAbstractVectorLayerLabeling
          */
         bool isScaleOK( double scale ) const;
 
+        /**
+         * Initialize filters. Automatically called by setFilterExpression.
+         */
         void initFilter();
 
         /**