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Anonymous committed 61b38fe

[1.3.X] Fixed #16904 -- Additional clarification regarding contrib.messages iteration. Thanks murphyke for the report and patch.

Backport of [16866] from trunk.

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docs/ref/contrib/messages.txt

 ``RequestContext``. Otherwise, ensure ``messages`` is available to
 the template context.
 
+Even if you know there is only just one message, you should still iterate over
+the ``messages`` sequence, because otherwise the message storage will not be cleared
+for the next request.
+
 Creating custom message levels
 ------------------------------