kde, kwrite not respect root file permissions in user folder

[mirivagu]

as root create test.txt in my home folder and exec:
ls -l test.txt: -rw-r--r-- 1 root root 0 nov 19 10:31 test.txt
chown username:username test.txt: operation not permitted
chroot +x test.txt: operation not permitted
edit with nano an save: permission denied
i tink it is a normal behavior, but if open and edit with kwrite, it save ok, and the file owner change to user_name:user_name.
it's normal??

ACCEPT_KEYWORDS="~amd64"
kde 4.14.2.
not overlays.
sorry for my bad english.

[lagalopex]

Yes, kwrite does not edit the file but save it as a tempfile, remove old one and rename temp.
(Removing as user is still possible as its your folder.)
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System: AMD FX 8350, 32GB EEC RAM, NVidia GeForce GTX 750 Ti, Asus M5A99X EVO R2.0

[mirivagu]

thanks, that makes sense