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Many times I lose mysettings for KMail, plsama, etc, because of full disk!
KDE should have some protection rewiting settings like:
1. write a new file settings -> echo "a new settings" > ~/kde/app.settings.new
2. rename old settings -> mv ~/kde/app.settings ~/kde/app.settings.old
3. rename new settings -> mv ~/kde/app.settings.new ~/kde/app.settings

It is very simple and very very useful for everyone with small free space on harddisk

Basically same as https://bugs.kde.org/show_bug.cgi?id=172061 and is related to a 6 year old bug https://bugs.kde.org/show_bug.cgi?id=58954