Avoid duplicating crowdanki_uuid when cloning deck config

Fix #118.

Testing, it seems that I somehow haven't broken the tests despite
fiddling with anki/hook_vendor without adding to the overrides.

Note that deck_conf_did_add_config is not available as a "legacy"
hook, so the new hook mechanism has to be used.  It might (or might
not) be worth converting the existing hooks to the new mechanism.

crowd_anki/anki/hook_vendor.py

@@ -1,10 +1,13 @@
+from aqt import gui_hooks
+
 from dataclasses import dataclass
 from typing import Any
 
 from ..config.config_settings import ConfigSettings
 from ..anki.adapters.hook_manager import AnkiHookManager
 from ..export.anki_exporter_wrapper import exporters_hook
 from ..history.archiver_vendor import ArchiverVendor
+from ..utils.deckconf import disambiguate_crowdanki_uuid
 
 
 @dataclass
@@ -16,6 +19,7 @@ class HookVendor:
     def setup_hooks(self):
         self.setup_exporter_hook()
         self.setup_snapshot_hooks()
+        self.setup_add_config_hook()
 
     def setup_exporter_hook(self):
         self.hook_manager.hook("exportersList", exporters_hook)
@@ -24,3 +28,6 @@ def setup_snapshot_hooks(self):
         snapshot_handler = ArchiverVendor(self.window, self.config).snapshot_on_sync
         self.hook_manager.hook('profileLoaded', snapshot_handler)
         self.hook_manager.hook('unloadProfile', snapshot_handler)
+
+    def setup_add_config_hook(self):
+        gui_hooks.deck_conf_did_add_config.append(disambiguate_crowdanki_uuid)

crowd_anki/utils/deckconf.py

@@ -0,0 +1,10 @@
+from .constants import UUID_FIELD_NAME
+
+def disambiguate_crowdanki_uuid(deck_conf, deck,
+                                config, new_name,
+                                new_conf_id):
+    new_deck_conf = deck_conf.mw.col.decks.get_config(new_conf_id)
+    if (new_deck_conf and (UUID_FIELD_NAME in new_deck_conf)):
+        # Delete rather than generating anew, (with uuid1()) to avoid code duplication.
+        del new_deck_conf[UUID_FIELD_NAME]
+        deck_conf.mw.col.decks.update_config(new_deck_conf)