Rename 'notrim' option to 'none' to be consistent with other options

test/test_YoutubeDL.py

@@ -715,7 +715,7 @@ class TestYoutubeDL(unittest.TestCase):
     def test_prepare_outtmpl_and_filename(self):
         def test(tmpl, expected, *, info=None, **params):
             if 'trim_file_name' not in params:
-                params['trim_file_name'] = 'notrim'  # disable trimming
+                params['trim_file_name'] = 'none'  # disable trimming
             params['outtmpl'] = tmpl
             ydl = FakeYDL(params)
             ydl._num_downloads = 1

yt_dlp/YoutubeDL.py

@@ -1439,9 +1439,9 @@ class YoutubeDL:
         filename = outtmpl % info_dict
 
         def parse_trim_file_name(trim_file_name):
-            if trim_file_name is None or trim_file_name == 'notrim':
+            if trim_file_name is None or trim_file_name == 'none':
                 return 0, None
-            mobj = re.match(r'(?:(?P<length>\d+)(?P<mode>b|c)?|notrim)', trim_file_name)
+            mobj = re.match(r'(?:(?P<length>\d+)(?P<mode>b|c)?|none)', trim_file_name)
             return int(mobj.group('length')), mobj.group('mode') or 'c'
 
         max_file_name, mode = parse_trim_file_name(self.params.get('trim_file_name'))

yt_dlp/__init__.py

@@ -429,7 +429,7 @@ def validate_options(opts):
     }
 
     # Other options
-    validate_regex('trim filenames', opts.trim_file_name, r'(?:\d+[bc]?|notrim)')
+    validate_regex('trim filenames', opts.trim_file_name, r'(?:\d+[bc]?|none)')
 
     if opts.playlist_items is not None:
         try:

yt_dlp/options.py

@@ -1378,7 +1378,7 @@ def create_parser():
         help='Sanitize filenames only minimally')
     filesystem.add_option(
         '--trim-filenames', '--trim-file-names', metavar='LENGTH',
-        dest='trim_file_name', default='notrim',
+        dest='trim_file_name', default='none',
         help='Limit the filename length (excluding extension) to the specified number of characters or bytes')
     filesystem.add_option(
         '-w', '--no-overwrites',