syntax: Remove pythonFunctionArgs as it's poorly implemented

syntax/python.vim

@@ -78,7 +78,7 @@ syn keyword pythonOperator      and in is not or
 " we provide a dummy group here to avoid crashing pyrex.vim.
 syn keyword pythonInclude       import
 syn keyword pythonImport        import
-syn match pythonIdentifier      '\v[a-zA-Z_][a-zA-Z0-9_]*' nextgroup=pythonFunctionArgs
+syn match pythonIdentifier      '\v[a-zA-Z_][a-zA-Z0-9_]*'
 syn match pythonRaiseFromStatement      '\<from\>'
 syn match pythonImport          '^\s*\zsfrom\>'
 
@@ -89,28 +89,26 @@ if s:Python2Syntax()
     syn keyword pythonStatement  print
   endif
   syn keyword pythonImport      as
-  syn match   pythonFunction    '[a-zA-Z_][a-zA-Z0-9_]*' nextgroup=pythonFunctionArgs display contained
+  syn match   pythonFunction    '[a-zA-Z_][a-zA-Z0-9_]*' display contained
 else
   syn keyword pythonStatement   as nonlocal
   syn match   pythonStatement   '\v\.@<!<await>'
-  syn match   pythonFunction    '[a-zA-Z_][a-zA-Z0-9_]*' nextgroup=pythonFunctionArgs display contained
+  syn match   pythonFunction    '[a-zA-Z_][a-zA-Z0-9_]*' display contained
   syn match   pythonStatement   '\<async\s\+def\>' nextgroup=pythonFunction skipwhite
   syn match   pythonStatement   '\<async\s\+with\>'
   syn match   pythonStatement   '\<async\s\+for\>'
   syn cluster pythonExpression contains=pythonStatement,pythonRepeat,pythonConditional,pythonOperator,pythonNumber,pythonHexNumber,pythonOctNumber,pythonBinNumber,pythonFloat,pythonString,pythonBytes,pythonBoolean,pythonBuiltinObj,pythonBuiltinFunc
 endif
 
-syn region pythonFunctionArgs start='('rs=s+1 end=')'re=e-1 contains=pythonFunctionArgs,pythonFunctionKwargs,pythonRepeat,pythonClassVar,pythonConditional,pythonComment,pythonOperator,pythonNumber,pythonNumberError,pythonFloat,pythonHexNumber,pythonStatement,pythonOctNumber,pythonString,pythonRawString,pythonUniString,pythonExClass,pythonUniRawString,pythonNumber,pythonRawString,pythonBytes,pythonBuiltinObj,pythonNone,pythonBuiltinFunc,pythonBoolean nextgroup=pythonRaiseFromStatement display contained
-syn match pythonFunctionKwargs /\i\+\ze=/ display contained
 "
 " Decorators (new in Python 2.4)
 "
 
 syn match   pythonDecorator    '^\s*\zs@' display nextgroup=pythonDottedName skipwhite
 if s:Python2Syntax()
-  syn match   pythonDottedName '[a-zA-Z_][a-zA-Z0-9_]*\%(\.[a-zA-Z_][a-zA-Z0-9_]*\)*' display contained nextgroup=pythonFunctionArgs
+  syn match   pythonDottedName '[a-zA-Z_][a-zA-Z0-9_]*\%(\.[a-zA-Z_][a-zA-Z0-9_]*\)*' display contained
 else
-  syn match   pythonDottedName '\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\)*' display contained nextgroup=pythonFunctionArgs
+  syn match   pythonDottedName '\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\%(\.\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*\)*' display contained
 endif
 syn match   pythonDot        '\.' display containedin=pythonDottedName
 
@@ -332,7 +330,7 @@ if s:Enabled('g:python_highlight_builtin_objs')
   syn keyword pythonNone        None
   syn keyword pythonBoolean     True False
   syn keyword pythonBuiltinObj  Ellipsis NotImplemented
-  syn match pythonBuiltinObj    '\v\.@<!<%(object|bool|int|float|tuple|str|list|dict|set|frozenset|bytearray|bytes)>' nextgroup=pythonFunctionArgs
+  syn match pythonBuiltinObj    '\v\.@<!<%(object|bool|int|float|tuple|str|list|dict|set|frozenset|bytearray|bytes)>'
   syn keyword pythonBuiltinObj  __debug__ __doc__ __file__ __name__ __package__
   syn keyword pythonBuiltinObj  __loader__ __spec__ __path__ __cached__
 endif
@@ -353,7 +351,7 @@ if s:Enabled('g:python_highlight_builtin_funcs')
       let s:funcs_re .= '|ascii|exec|memoryview|print'
   endif
 
-  execute 'syn match pythonBuiltinFunc ''\v\.@<!\zs<%('  . s:funcs_re .  ')>'' nextgroup=pythonFunctionArgs'
+  execute 'syn match pythonBuiltinFunc ''\v\.@<!\zs<%('  . s:funcs_re .  ')>'''
   unlet s:funcs_re
 endif
 
@@ -370,7 +368,7 @@ if s:Enabled('g:python_highlight_exceptions')
       let s:exs_re .= '|BlockingIOError|ChildProcessError|ConnectionError|BrokenPipeError|ConnectionAbortedError|ConnectionRefusedError|ConnectionResetError|FileExistsError|FileNotFoundError|InterruptedError|IsADirectoryError|NotADirectoryError|PermissionError|ProcessLookupError|TimeoutError|StopAsyncIteration|ResourceWarning'
   endif
 
-  execute 'syn match pythonExClass ''\v\.@<!\zs<%(' . s:exs_re . ')>'' nextgroup=pythonFunctionArgs'
+  execute 'syn match pythonExClass ''\v\.@<!\zs<%(' . s:exs_re . ')>'''
   unlet s:exs_re
 endif
 
@@ -463,7 +461,6 @@ if v:version >= 508 || !exists('did_python_syn_inits')
 
   HiLink pythonExClass          Structure
   HiLink pythonClassVar         Identifier
-  HiLink pythonFunctionKwargs   Identifier
 
   delcommand HiLink
 endif