[SRU] libreoffice 24.2.5 for noble

[Rico Tzschichholz]

[Impact]

 * LibreOffice 24.2.5 is in its fifth bugfix release of the 24.2 line:
     https://wiki.documentfoundation.org/ReleasePlan/24.2#24.2.5_release

 * Version 24.2.4 is currently released in noble. For a list of fixed bugs compared to 24.2.4 see the list of bugs fixed in the release candidates of 24.2.5 (that's a total of 78 bugs):
     https://wiki.documentfoundation.org/Releases/24.2.5/RC1#List_of_fixed_bugs
     https://wiki.documentfoundation.org/Releases/24.2.5/RC2#List_of_fixed_bugs

     24.2.5 RC2 is identical to the 24.2.5 release

 * Given the nature of the project, the complexity of the codebase and the high level of quality assurance upstream, it is preferable to SRU a minor release rather than cherry-pick selected bug fixes.

[Testing]

 * Upstream testing. Bugs fixed upstream typically include unit/regression tests, and the release itself is extensively exercised (both in an automated manner and manually).

  * A recent set of upstream's automated jenkins testing can be found here:
    https://ci.libreoffice.org/job/gerrit_242/1277/

  * More information about the upstream QA testing can be found here:
    * Automated tests
      https://wiki.documentfoundation.org/QA/Testing/Automated_Tests
    * Automated UI tests
      https://wiki.documentfoundation.org/Development/UITests
    * Regression tests
      https://wiki.documentfoundation.org/QA/Testing/Regression_Tests
    * Feature tests
      https://wiki.documentfoundation.org/QA/Testing/Feature_Tests

 * Launchpad testing. The libreoffice packages include autopkgtests that were run and verified as passing.
    Tested build can be found at https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-prereleases/+sourcepub/16265079/+listing-archive-extra
    * [amd64] https://autopkgtest.ubuntu.com/results/autopkgtest-noble-libreoffice-libreoffice-prereleases/noble/amd64/libr/libreoffice/20240713_153605_52297@/log.gz
    * [arm64] https://autopkgtest.ubuntu.com/results/autopkgtest-noble-libreoffice-libreoffice-prereleases/noble/arm64/libr/libreoffice/20240713_160156_7ef87@/log.gz
    * [armhf] https://autopkgtest.ubuntu.com/results/autopkgtest-noble-libreoffice-libreoffice-prereleases/noble/armhf/libr/libreoffice/20240713_164543_bd1c9@/log.gz
    * [ppc64el] https://autopkgtest.ubuntu.com/results/autopkgtest-noble-libreoffice-libreoffice-prereleases/noble/ppc64el/libr/libreoffice/20240713_145657_249c9@/log.gz
    * [riscv64] not available
    * [s390x] https://autopkgtest.ubuntu.com/results/autopkgtest-noble-libreoffice-libreoffice-prereleases/noble/s390x/libr/libreoffice/20240713_153908_6c9ec@/log.gz
 * General smoke testing of all the applications in the office suite were carried out by going through the manual testplan as documented by: https://wiki.ubuntu.com/Process/Merges/TestPlans/libreoffice

 * Packaging changes are staged at https://git.launchpad.net/~libreoffice/ubuntu/+source/libreoffice/log/?h=wip/noble-24.2

[Regression Potential]

 * A minor release with a total of 78 bug fixes always carries the potential for introducing regressions, even though it is a bugfix-only release, meaning that no new features were added, and no existing features were removed.

 * A combination of autopkgtests and careful smoke testing as described above should provide reasonable confidence that no regressions sneaked in.