From 4033cc2ebd411767adacfc61946c6294aa7a8519 Mon Sep 17 00:00:00 2001
From: Alessandro Pasotti <elpaso@itopen.it>
Date: Tue, 15 May 2018 19:17:32 +0200
Subject: [PATCH] Set form feature in current_feature variable instead of

... setting the feature member variable
---
 src/core/qgsexpressioncontext.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/qgsexpressioncontext.cpp b/src/core/qgsexpressioncontext.cpp
index d5787c8102b..37fca724a09 100644
--- a/src/core/qgsexpressioncontext.cpp
+++ b/src/core/qgsexpressioncontext.cpp
@@ -747,7 +747,7 @@ class GetCurrentFormFieldValue : public QgsScopedExpressionFunction
     QVariant func( const QVariantList &values, const QgsExpressionContext *context, QgsExpression *, const QgsExpressionNodeFunction * ) override
     {
       QString fieldName( values.at( 0 ).toString() );
-      const QgsFeature feat( context->feature() );
+      const QgsFeature feat( context->variable( QStringLiteral( "current_feature" ) ).value<QgsFeature>() );
       if ( fieldName.isEmpty() || ! feat.isValid( ) )
       {
         return QVariant();
@@ -793,9 +793,9 @@ class GetProcessingParameterValue : public QgsScopedExpressionFunction
 QgsExpressionContextScope *QgsExpressionContextUtils::formScope( const QgsFeature &formFeature )
 {
   QgsExpressionContextScope *scope = new QgsExpressionContextScope( QObject::tr( "Form" ) );
-  scope->setFeature( formFeature );
   scope->addFunction( QStringLiteral( "current_value" ), new GetCurrentFormFieldValue( ) );
   scope->setVariable( QStringLiteral( "current_geometry" ), formFeature.geometry( ), true );
+  scope->setVariable( QStringLiteral( "current_feature" ), formFeature, true );
   return scope;
 }