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[bugfix] Do not delegate logging output to the root logger

Bug: T281643
Change-Id: Ie0a9a4c250211968dc1ef34340d9b9e107b71ce7
---
M pywikibot/bot.py
1 file changed, 1 insertion(+), 0 deletions(-)

diff --git a/pywikibot/bot.py b/pywikibot/bot.py
index b7eb314..c5fd565 100644
--- a/pywikibot/bot.py
+++ b/pywikibot/bot.py
@@ -388,6 +388,7 @@
         warnings.filterwarnings('once', category=FutureWarning)
 
     root_logger.handlers = []  # remove any old handlers
+    root_logger.propagate = False  # T281643
 
     # configure handler(s) for display to user interface
     assert ui is not None

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