plasma5 session saving is broken

[Andriy Gapon]

Session restore options "On last logout" and "When session was manually saved" 
do not work at the moment for Plasma 5.
They got broken some months ago and still don't work.
Plasma always starts with an empty session (plus auto-start).

The problem seems to be related to writing iceauth file.

It seems that there is a fix (committed after 5.27.11.1 ), but there hasn't been 
a release since then.
The fix is quite small and trivial.
Maybe it would be good to add it as a patch to x11/plasma5-plasma-workspace.

References:
- https://bugs.kde.org/show_bug.cgi?id=487912
- https://bugs.kde.org/show_bug.cgi?id=488520
- 
https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/4405/diffs?commit_id=e109503c8ee12866ecfbd3aaf89170a753f2ea84
- 
https://invent.kde.org/plasma/plasma-workspace/-/commit/1181acfe30557d6646511df8d98d82589878a570
- https://kde.org/info/security/advisory-20240531-1.txt

Just in case, timeline for 5.27:
- May 31, 2024, the bug is introduced in 10a7ddd0
- 5.27.11.1 is released as a security fix for CVE-2024-36041
- Jun 04, 2024, the bug fix is committed in 1181acfe

P.S.
I wonder why KDE folks haven't created any source repository tag for plasma 
workspace 5.27.11.1.  Seems like an oversight.

-- 
Andriy Gapon