[PR] Preserve HTMLLayout attribute values during XML normalization [logging-log4cxx]

["jmestwa-coder (via GitHub)" <gi...@apache.org>]

jmestwa-coder opened a new pull request, #666:
URL: https://github.com/apache/logging-log4cxx/pull/666

   ## Summary
   
   Fix HTMLLayout attribute serialization to preserve logger and thread values containing normalization-sensitive characters.
   
   ## Changes
   
   - Add `Transform::appendEscapingAttribute()` for HTML/XML attribute-specific escaping
   - Use attribute escaping for `title` attributes in `HTMLLayout`
   - Preserve newline, tab, and carriage return characters using character references
   - Keep existing element body escaping behavior unchanged
   - Add regression coverage for normalization-sensitive attribute values
   
   ## Problem
   
   `HTMLLayout` previously used `appendLegalCharacters()` for quoted attribute values.
   
   Characters such as newline and tab were emitted directly into `title` attributes, allowing XML attribute normalization to alter serialized logger/thread values after parsing.


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Re: [PR] Preserve HTMLLayout attribute values during XML normalization [logging-log4cxx]

["swebb2066 (via GitHub)" <gi...@apache.org>]

swebb2066 merged PR #666:
URL: https://github.com/apache/logging-log4cxx/pull/666


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