Apply suggestions from code review

Co-authored-by: Raphael Michel <michel@rami.io>

src/pretix/base/logentrytypes.py

@@ -55,7 +55,7 @@ def make_link(a_map, wrapper, is_active=True, event=None, plugin_name=None):
 class LogEntryTypeRegistry(EventPluginRegistry):
     def new_from_dict(self, data):
         """
-        Register multiple instance of a LogEntryType class with different action_type
+        Register multiple instance of a `LogEntryType` class with different `action_type`
         and plain text strings, as given by the items of the specified data dictionary.
 
         This method is designed to be used as a decorator as follows:
@@ -142,7 +142,7 @@ class LogEntryType:
 
 class EventLogEntryType(LogEntryType):
     """
-    Base class for any LogEntry type whose content_object is either an `Event` itself or belongs to a specific `Event`.
+    Base class for any `LogEntry` type whose `content_object` is either an `Event` itself or belongs to a specific `Event`.
     """
 
     def get_object_link_info(self, logentry) -> dict:
@@ -183,7 +183,9 @@ class VoucherLogEntryType(EventLogEntryType):
     object_link_argname = 'voucher'
 
     def object_link_display_name(self, voucher):
-        return voucher.code[:6]
+        if len(voucher.code) > 6:
+            return voucher.code[:6] + "…"
+        return voucher.code
 
 
 class ItemLogEntryType(EventLogEntryType):

src/pretix/base/signals.py

@@ -254,7 +254,7 @@ class Registry:
 
     def __init__(self, keys):
         """
-        :param keys: dictionary {key: accessor_function}
+        :param keys: Dictionary with `{key: accessor_function}`
                      When a new entry is registered, all accessor functions are called with the new entry as parameter.
                      Their return value is stored as the metadata value for that key.
         """
@@ -281,10 +281,12 @@ class Registry:
             for key, value in meta.items():
                 self.by_key[key][value] = tup
             self.registered_entries.append(tup)
+        if len(objs) == 1:
+            return objs[0]
 
     def new(self, *args, **kwargs):
         """
-        Instantiate the decorated class with the given *args and **kwargs, and register the instance in this registry.
+        Instantiate the decorated class with the given `*args` and `**kwargs`, and register the instance in this registry.
         May be used multiple times.
 
         .. code-block:: python
@@ -306,10 +308,11 @@ class Registry:
         return self.by_key.get(key).get(value, (None, None))
 
     def filter(self, **kwargs):
-        return ((entry, meta)
-                for entry, meta in self.registered_entries
-                if all(value == meta[key] for key, value in kwargs.items())
-                )
+        return (
+            (entry, meta)
+            for entry, meta in self.registered_entries
+            if all(value == meta[key] for key, value in kwargs.items())
+        )
 
 
 class EventPluginRegistry(Registry):