web: fix edge case in bbcode processing

BOINC / boinc

Open-source software for volunteer computing and grid computing.

https://boinc.berkeley.edu

GNU Lesser General Public License v3.0

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Closed davidpanderson closed 2 months ago

davidpanderson commented 2 months ago

[code] and [pre] aren't nestable. Process them separately from nestable constructs.

Fixes #1381