[BPO] libreoffice 7.5.9 for jammy

[Rico Tzschichholz]

[Impact]

 * LibreOffice 7.5.9 is in its ninth and last bugfix release of the 7.5 line:
     https://wiki.documentfoundation.org/ReleasePlan/7.5#7.5.9_release

 * This source packages matches the proposed SRU for lunar handled at
     https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/2044369

[Scope]

 * Backport of https://launchpad.net/ubuntu/+source/libreoffice/4:7.5.9-0ubuntu0.23.04.1

 * Backport target is Jammy/22.04 LTS releases to provide an official build of a more recent upstream version of LibreOffice

[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_75/1776/

  * 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.

   Jammy/22.04 build at https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-still/+sourcepub/15416837/+listing-archive-extra
    * [amd64] https://autopkgtest.ubuntu.com/results/autopkgtest-jammy-libreoffice-libreoffice-still/jammy/amd64/libr/libreoffice/20231208_123108_1b879@/log.gz
    * [arm64] https://autopkgtest.ubuntu.com/results/autopkgtest-jammy-libreoffice-libreoffice-still/jammy/arm64/libr/libreoffice/20231208_175608_c3b14@/log.gz
    * [armhf] ... (autopkgtests infra problems on this arch)
    * [ppc64el] https://autopkgtest.ubuntu.com/results/autopkgtest-jammy-libreoffice-libreoffice-still/jammy/ppc64el/libr/libreoffice/20231208_135706_f6680@/log.gz
    * [riscv64] not available
    * [s390x] https://autopkgtest.ubuntu.com/results/autopkgtest-jammy-libreoffice-libreoffice-still/jammy/s390x/libr/libreoffice/20231208_150850_45529@/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

[Regression Potential]

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

[Rico Tzschichholz (ricotz)]

Please accept this backport which is still waiting in the jammy queue. It is still a security update.

[Dan Streetman (ddstreet)]

approved, very sorry for the long delay.