- Add more commits from KDE's 5.15 branch:
* 0008-Fix-memory-leak-in-QWaylandGLContext.patch (QTBUG-85608)
* 0009-Client-Send-set_window_geometry-only-once-configured.patch
* 0010-Translate-opaque-area-with-frame-margins.patch
* 0011-Client-Send-exposeEvent-to-parent-on-subsurface-posi.patch
(QTBUG-86177)
* 0012-Get-correct-decoration-margins-region.patch
* 0013-xdgshell-Tell-the-compositor-the-screen-we-re-expect.patch
* 0014-Fix-compilation.patch
* 0015-client-Allow-QWaylandInputContext-to-accept-composed.patch
(kde#405388)
* 0016-Client-Announce-an-output-after-receiving-more-compl.patch
(kde#435124)
* 0017-Fix-issue-with-repeated-window-size-changes.patch
* 0018-Include-locale.h-for-setlocale-LC_CTYPE.patch

- Add commits from upstream's 5.15 branch:
* 0002-Make-setting-QT_SCALE_FACTOR-work-on-Wayland.patch (QTBUG-87762)
* 0003-Do-not-try-to-eglMakeCurrent-for-unintended-case.patch (QTBUG-88277)
* 0004-Make-setting-QT_SCALE_FACTOR-work-on-Wayland.patch (QTBUG-87762, QTBUG-88064)
* 0005-Ensure-that-grabbing-is-performed-in-correct-context.patch (QTBUG-87597)
* 0006-Fix-leaked-subsurface-wayland-items.patch (QTBUG-88782)
- Add commit from KDE's 5.15 branch:
* 0007-Use-qWarning-and-_exit-instead-of-qFatal-for-wayland.patch