Always add a dummy atlas expression context scope to canvas expression

context This allows the atlas variables to be correctly available before an atlas has been first opened - e.g. for rules which render when a feature is not the current atlas feature. Otherwise these variables are NULL, which creates confusing behavior when rendering differences occur before/after an atlas is opened. (cherry-picked from 64707c)
qgis · Apr 2, 2018 · 94b7c88 · 94b7c88
1 parent e863dc6
commit 94b7c88
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/gui/qgsmapcanvas.cpp b/src/gui/qgsmapcanvas.cpp
@@ -499,6 +499,7 @@ void QgsMapCanvas::refreshMap()
   QgsExpressionContext expressionContext;
   expressionContext << QgsExpressionContextUtils::globalScope()
                     << QgsExpressionContextUtils::projectScope( QgsProject::instance() )
+                    << QgsExpressionContextUtils::atlasScope( nullptr )
                     << QgsExpressionContextUtils::mapSettingsScope( mSettings )
                     << new QgsExpressionContextScope( mExpressionContextScope );