[processing] Ensure that distance inputs become expression variables for model child algorithms

nyalldawson · nyalldawson · commit 7e106ef4b78c · 2019-02-08T19:00:39.000+10:00
diff --git a/src/core/processing/models/qgsprocessingmodelalgorithm.cpp b/src/core/processing/models/qgsprocessingmodelalgorithm.cpp
@@ -593,6 +593,7 @@ QMap<QString, QgsProcessingModelAlgorithm::VariableDefinition> QgsProcessingMode
 
   // "static"/single value sources
   QgsProcessingModelChildParameterSources sources = availableSourcesForChild( childId, QStringList() << QgsProcessingParameterNumber::typeName()
+      << QgsProcessingParameterDistance::typeName()
       << QgsProcessingParameterBoolean::typeName()
       << QgsProcessingParameterExpression::typeName()
       << QgsProcessingParameterField::typeName()
