Item15075: deep recursion on innocent code

This here once worked:

   * Set MYMACRO = This a test for web %web{default="%WEB%"}%

However this expands to:

You type	You get	Should be
%MYMACRP%	This a test for web Tasks	This a test for web Task
%MYMACRO{}%	This a test for web Tasks	This a test for web Task
%MYMACRO{"yolo"}%	This a test for web WEB	This a test for web Task

The third example creates an entry in Foswiki's error.log

Max recursive depth reached: %WEB% at Tasks.Item15075

every time this topic is loaded. However there is no recursion happening here other than the default that has to be expanded while expanding %MYMACRO. It seems there is a long standing error in Foswiki.pm where _expandMacroOnTopicRendering() is calling _processMacros() with a depth of 1 for its attributes ... which immediately results in a max recursion warning.

This must be raised to the normal value as being used elsewhere when calling _processMacros() with an initial depth value of 16.

-- MichaelDaum - 29 Mar 2022

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