gh-91555: Revert disabling of logger while handling log record. (GH-135858)

Revert "gh-91555: disable logger while handling log record (GH-131812)"

This reverts commit 2561e148ec.

Lib/logging/__init__.py

@@ -1475,8 +1475,6 @@ class Logger(Filterer):
     level, and "input.csv", "input.xls" and "input.gnu" for the sub-levels.
     There is no arbitrary limit to the depth of nesting.
     """
-    _tls = threading.local()
-
     def __init__(self, name, level=NOTSET):
         """
         Initialize the logger with a name and an optional level.
@@ -1673,19 +1671,14 @@ class Logger(Filterer):
         This method is used for unpickled records received from a socket, as
         well as those created locally. Logger-level filtering is applied.
         """
-        if self._is_disabled():
+        if self.disabled:
             return
-
-        self._tls.in_progress = True
-        try:
-            maybe_record = self.filter(record)
-            if not maybe_record:
-                return
-            if isinstance(maybe_record, LogRecord):
-                record = maybe_record
-            self.callHandlers(record)
-        finally:
-            self._tls.in_progress = False
+        maybe_record = self.filter(record)
+        if not maybe_record:
+            return
+        if isinstance(maybe_record, LogRecord):
+            record = maybe_record
+        self.callHandlers(record)
 
     def addHandler(self, hdlr):
         """
@@ -1773,7 +1766,7 @@ class Logger(Filterer):
         """
         Is this logger enabled for level 'level'?
         """
-        if self._is_disabled():
+        if self.disabled:
             return False
 
         try:
@@ -1823,11 +1816,6 @@ class Logger(Filterer):
                        if isinstance(item, Logger) and item.parent is self and
                        _hierlevel(item) == 1 + _hierlevel(item.parent))
 
-    def _is_disabled(self):
-        # We need to use getattr as it will only be set the first time a log
-        # message is recorded on any given thread
-        return self.disabled or getattr(self._tls, 'in_progress', False)
-
     def __repr__(self):
         level = getLevelName(self.getEffectiveLevel())
         return '<%s %s (%s)>' % (self.__class__.__name__, self.name, level)