Add tag to XML file when edited DayOne entry

jrnl/DayOneJournal.py

@@ -167,7 +167,7 @@ class DayOne(Journal.Journal):
         return "\n".join([f"{str(e)}\n# {e.uuid}\n" for e in self.entries])
 
     def _update_old_entry(self, entry: Entry, new_entry: Entry) -> None:
-        for attr in ("title", "body", "date"):
+        for attr in ("title", "body", "date", "tags"):
             old_attr = getattr(entry, attr)
             new_attr = getattr(new_entry, attr)
             if old_attr != new_attr:

tests/bdd/features/write.feature

@@ -303,7 +303,7 @@ Feature: Writing new entries.
         And we use the password "test" if prompted
         And we append to the editor if opened
             This is a small addendum to my latest entry.
-        When we run "jrnl --edit"
+        When we run "jrnl --edit -1"
         Then the output should contain
             1 entry modified
 
@@ -334,3 +334,20 @@ Feature: Writing new entries.
         When we run "jrnl work This is a new entry"
         Then the output should contain "Entry added to work journal"
         And we should get no error
+
+    Scenario Outline: Tags are saved when an entry is edited with --edit and can be searched afterward
+        Given we use the config "<config_file>"
+        And we use the password "test" if prompted
+        And we append to the editor if opened
+            @newtag
+        When we run "jrnl --edit -1"
+        When we run "jrnl --tags @newtag"
+        Then the output should contain
+            1 entry found
+
+        Examples: configs
+        | config_file          |
+        | basic_onefile.yaml   |
+        | basic_encrypted.yaml |
+        | basic_folder.yaml    |
+        | basic_dayone.yaml    |