[processing] Allow providers to return path to SVG icon

Author: nyalldawson

python/core/processing/qgsprocessingprovider.sip

@@ -20,9 +20,16 @@ class QgsProcessingProvider
 
     /**
      * Returns an icon for the provider.
+     * @see svgIcon()
      */
     virtual QIcon icon() const;
 
+    /**
+     * Returns a path to an SVG version of the provider's icon.
+     * @see icon()
+     */
+    virtual QString svgIconPath() const;
+
     /**
      * Returns the unique provider id, used for identifying the provider. This string
      * should be a unique, short, character only string, eg "qgis" or "gdal". This

src/core/processing/qgsprocessingprovider.cpp

@@ -20,5 +20,10 @@
 
 QIcon QgsProcessingProvider::icon() const
 {
-  return QgsApplication::getThemeIcon( "/alg.svg" );
+  return QgsApplication::getThemeIcon( "/processingAlgorithm.svg" );
+}
+
+QString QgsProcessingProvider::svgIconPath() const
+{
+  return QgsApplication::iconPath( "processingAlgorithm.svg" );
 }

src/core/processing/qgsprocessingprovider.h

@@ -48,9 +48,16 @@ class CORE_EXPORT QgsProcessingProvider
 
     /**
      * Returns an icon for the provider.
+     * @see svgIcon()
      */
     virtual QIcon icon() const;
 
+    /**
+     * Returns a path to an SVG version of the provider's icon.
+     * @see icon()
+     */
+    virtual QString svgIconPath() const;
+
     /**
      * Returns the unique provider id, used for identifying the provider. This string
      * should be a unique, short, character only string, eg "qgis" or "gdal". This