add merged set to graph of sources if source sets are in same graph (#185)

close #164

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #185

src/gui_qt/main/management.py

@@ -347,6 +347,7 @@ class UpperManagement(QtCore.QObject):
         group_set = set()
         name_set = set()
         value_set = set()
+        graph_set = set()
 
         if src_sets is None:
             if self.current_graph:
@@ -364,6 +365,7 @@ class UpperManagement(QtCore.QObject):
             name_set.add(data_i.name)
             group_set.add(data_i.group)
             value_set.add(data_i.value)
+            graph_set.add(data_i.graph)
 
         if joined is not None:
             joined.group = '+'.join(group_set)
@@ -374,7 +376,9 @@ class UpperManagement(QtCore.QObject):
             else:
                 joined.value = 0.0
 
-            self.newData.emit([self.add(joined)], self.current_graph)
+            dest_graph = graph_set.pop() if len(graph_set) == 1 else self.current_graph
+
+            self.newData.emit([self.add(joined)], dest_graph)
 
     def get_data(self, sid: str, xy_only: bool = False):
         """