commit: Select all instances of same folder at once

When you manually select a folder and there are multiple instances of
the same one (same name, almost same id), always select all of them at
once.

src/python/klausurarchiv/folder_selection.py

@@ -293,13 +293,22 @@ class FolderSelectActivity:
         
         if item!=None:
           if s.addItem(item):
+            q=search.util.SESearcher(item.display_title+item.id[:-1])
+            other_item_instances = [
+              v
+              for v in s._all_folders
+              if  q.match(v.display_title+v.id[:-1]) ]
+            for oii in other_item_instances:
+              if oii!=item:
+                s.addItem(oii,silent=True)
             s.clear_query()
           return True
     return default
   
   ## \brief Called internally to add a folder to the list of selected folders.
-  def addItem(s,item):
+  def addItem(s,item,silent=False):
     if item in s.folders:
+      if not silent:
         s.message=(
           "Ordner %s ist bereits ausgewählt."%item.display_title,
           s.attr_error)