make sure that the name and value columns are always visible in the plto window; fix concatenate with shuffled groups that do not have a channel group source

Author: danielhrisca

src/asammdf/gui/widgets/tree.py

@@ -1839,6 +1839,8 @@ def set_header_columns_visibility(self, visibility):
             col = getattr(self, name, -1)
             if col == -1:
                 continue
+            elif name in ("NameColumn", "ValueColumn"):
+                is_visible = True
 
             self.setColumnHidden(col, not is_visible)
 
@@ -1847,6 +1849,8 @@ def set_header_sizes(self, sizes):
             col = getattr(self, name, -1)
             if col == -1:
                 continue
+            elif name in ("NameColumn", "ValueColumn"):
+                size = max(size, 50)
 
             self.setColumnWidth(col, size)
 

src/asammdf/mdf.py

@@ -3263,9 +3263,14 @@ def concatenate(
                                 new_group_source = new_group.channel_group.acq_source
                                 if (
                                     new_group.channel_group.acq_name == org_group.channel_group.acq_name
-                                    and (new_group_source and org_group_source)
-                                    and new_group_source.name == org_group_source.name
-                                    and new_group_source.path == org_group_source.path
+                                    and (
+                                        ((new_group_source and org_group_source)
+                                        and new_group_source.name == org_group_source.name
+                                        and new_group_source.path == org_group_source.path
+                                        )
+                                        or (new_group_source is None and org_group_source is None)
+                                    )
+
                                     and new_group.channel_group.samples_byte_nr
                                     == org_group.channel_group.samples_byte_nr
                                 ):