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[3.0.x] Documented admonition on when to use custom signals 

Thanks Cesar Canassa for the suggestion and Aymeric Augustin for review.
Backport of 566fca14b3 from master
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Adam Johnson 2019-09-25 10:28:08 +01:00
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docs/topics/signals.txt
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@ -206,6 +206,12 @@ Defining and sending signals
Your applications can take advantage of the signal infrastructure and provide Your applications can take advantage of the signal infrastructure and provide
its own signals. its own signals.
.. admonition:: When to use custom signals
Signals are implicit function calls which make debugging harder. If the
sender and receiver of your custom signal are both within your project,
you're better off using an explicit function call.
Defining signals Defining signals
---------------- ----------------