servo: Merge #7499 - Improve style nit check for space after a comma (from nerith:style); r=metajack

Fixes #7345.

Source-Repo: https://github.com/servo/servo
Source-Revision: 3424e234c8c86e787edfce6dc63ed155617e0e85

servo/python/tidy.py

@@ -230,8 +230,8 @@ def check_rust(file_name, contents):
         # get rid of attributes that do not contain =
         line = re.sub('^#[A-Za-z0-9\(\)\[\]_]*?$', '', line)
 
-        match = re.search(r",[A-Za-z0-9]", line)
-        if match:
+        match = re.search(r",[^\s]", line)
+        if match and '$' not in line:
             yield (idx + 1, "missing space after ,")
 
         if line_is_attribute(line):