gnucash stable: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/aa339b46 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/01366f42 (commit)
	from  https://github.com/Gnucash/gnucash/commit/eeedd7bf (commit)



commit aa339b4674a273d6f62485bb1a82b3d5c2e3c9a8
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sun Jun 22 09:26:36 2025 +0800

    [Transaction.cpp] use g_list_copy_deep

commit 01366f425fa2ebe70152de7bd994558699e028fa
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Jun 28 23:09:22 2025 +0800

    [gtest-load-and-test-datafile.cpp] add example .gnucash to test contents
    
    seed xml datafile to test stability of XML serialization routines



Summary of changes:
 libgnucash/backend/xml/test/CMakeLists.txt         |   5 +
 libgnucash/backend/xml/test/gtest-xml-contents.cpp | 204 +++++++
 .../backend/xml/test/test-files/CMakeLists.txt     |   5 +-
 .../test/test-files/xml-contents/CMakeLists.txt    |   4 +
 .../test-files/xml-contents/xml-datafile.gnucash   | 595 +++++++++++++++++++++
 libgnucash/engine/Transaction.cpp                  |   9 +-
 6 files changed, 813 insertions(+), 9 deletions(-)
 create mode 100644 libgnucash/backend/xml/test/gtest-xml-contents.cpp
 create mode 100644 libgnucash/backend/xml/test/test-files/xml-contents/CMakeLists.txt
 create mode 100644 libgnucash/backend/xml/test/test-files/xml-contents/xml-datafile.gnucash