Fix for Spotify Candidate Lookup. Changed query from double to single quotes. (#6049)

I noticed that spotify did not return any candidates for some of my
examples, but adding the search id manually would give a very good
match. I debugged it a bit and it seems like spotify does not like
double quotes we used for the search query.

Using single quotes fixed it for me.

Note that this does not seem to be documented in the [spotify api
documentation](https://developer.spotify.com/documentation/web-api/reference/search)

The example I used:

```
# Query with double quotes, which does not return any candidates
# Searching Spotify for 'album:"Flamethrower" artist:"Circadian, Cody Frost"'
https://api.spotify.com/v1/search?offset=0&limit=50&query=album%3A%22Flamethrower%22%20artist%3A%22Circadian%2C%20Cody%20Frost%22&type=album


# New Query
# Searching Spotify for 'album:'Flamethrower' artist:'Circadian, Cody Frost''
https://api.spotify.com/v1/search?offset=0&limit=5&query=album%3A%27Flamethrower%27%20artist%3A%27Circadian%2C%20Cody%20Frost%27&type=album
```

beets/metadata_plugins.py

@@ -412,7 +412,7 @@ class SearchApiMetadataSourcePlugin(
         :return: Query string to be provided to the search API.
         """
 
-        components = [query_string, *(f'{k}:"{v}"' for k, v in filters.items())]
+        components = [query_string, *(f"{k}:'{v}'" for k, v in filters.items())]
         query = " ".join(filter(None, components))
 
         if self.config["search_query_ascii"].get():

docs/changelog.rst

@@ -27,6 +27,8 @@ Bug fixes:
   matching. :bug:`5189`
 - :doc:`plugins/discogs` Fixed inconsistency in stripping disambiguation from
   artists but not labels. :bug:`5366`
+- :doc:`plugins/spotify` Fixed an issue where candidate lookup would not find
+  matches due to query escaping (single vs double quotes).
 
 For packagers:
 

test/plugins/test_spotify.py

@@ -82,8 +82,8 @@ class SpotifyPluginTest(PluginTestCase):
         params = _params(responses.calls[0].request.url)
         query = params["q"][0]
         assert "duifhjslkef" in query
-        assert 'artist:"ujydfsuihse"' in query
-        assert 'album:"lkajsdflakjsd"' in query
+        assert "artist:'ujydfsuihse'" in query
+        assert "album:'lkajsdflakjsd'" in query
         assert params["type"] == ["track"]
 
     @responses.activate
@@ -117,8 +117,8 @@ class SpotifyPluginTest(PluginTestCase):
         params = _params(responses.calls[0].request.url)
         query = params["q"][0]
         assert "Happy" in query
-        assert 'artist:"Pharrell Williams"' in query
-        assert 'album:"Despicable Me 2"' in query
+        assert "artist:'Pharrell Williams'" in query
+        assert "album:'Despicable Me 2'" in query
         assert params["type"] == ["track"]
 
     @responses.activate
@@ -233,8 +233,8 @@ class SpotifyPluginTest(PluginTestCase):
             params = _params(responses.calls[0].request.url)
             query = params["q"][0]
             assert item.title in query
-            assert f'artist:"{item.albumartist}"' in query
-            assert f'album:"{item.album}"' in query
+            assert f"artist:'{item.albumartist}'" in query
+            assert f"album:'{item.album}'" in query
             assert not query.isascii()
 
         # Is not found in the library if ascii encoding is enabled