* Add kubuntu_17_upstream_r860376.diff which fixed a pointer problem in korganizer leading to objects being lost. * Add kubuntu_18_upstream_r857911.diff to make sure that the inbox folder doesn't stay hidden if content is added. - See http://bugs.kde.org/show_bug.cgi?id=168544 * Add kubuntu_19_fix_gcal_crash.diff which fixes problems with remote resources crashing kontact, most notably when using GCal. (LP: #286905) * Add kubuntu_20_upstream_r882942.diff which prevents incidence loss under certain conditions as the UID map wasn't being reloaded. * Add kubuntu_21_upstream_r882976.diff to prevent KMail crashing due to certain malicious base64-encoded mail parts.