The KDE Qt5 Patch Collection has been rebased on top of Qt 5.15.19

Commit: https://invent.kde.org/qt/qt/qt5/-/commit/aa749695075684f0c8585ede19e361f9accb4287Commercial release announcement: https://www.qt.io/blog/commercial-lts-qt-5.15.19-released OpenSource release announcement: https://lists.qt-project.org/pipermail/announce/2026-May/000626.