Bug#833479: libmail-thread-perl: [PATCH] avoid recursion warnings in recurse_down

[Eric Wong]

Package: libmail-thread-perl
Version: 2.55-2
Severity: normal
Tags: upstream patch

Reporting here, too, since upstream seems dead.

There is no need to actually perform recursion when traversing
messages to perform callbacks on them.  This quiets down
recursion warnings in large threads (and may avoid crashes).

ref: https://rt.cpan.org/Ticket/Display.html?id=116727
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