https://bugs.kde.org/show_bug.cgi?id=344546 https://bugs.kde.org/show_bug.cgi?id=358673 https://bugs.kde.org/show_bug.cgi?id=352869
Difficult: https://bugs.kde.org/show_bug.cgi?id=363364
Simple: https://bugs.kde.org/show_bug.cgi?id=359859
Interesting: https://phabricator.kde.org/T1303
Can be considered abandoned now.