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In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

GIT_SILENT: use new cmake-3.19.0 feature. cmake --preset=dev or other it will provide correct cmake settings

If the Item Viewer is visible in the sidebar and the Agenda or Month
view shows more than one occurrence of an incidence, and the user
selects several of them in turn, the Item Viewer does not update after
the first one, because CalendarView does not check whether the
selected date has changed.

(cherry picked from commit 249f5e60)

These icons are already present in Oxygen, and a far as I can see,
KOrganizer doesn't actually use them.

`this` is passed as a parent pointer when the EventViewer is created,
so it is deleted automatically.

Prior to this patch Korganizer showed tooltips for the wrong
collections. Simplified this code to generate the tooltip string on
demand as well, this also fixes the issue.

Allow to use UNITY build see https://cmake.org/cmake/help/latest/prop_tgt/UNITY_BUILD.html (Reduce compile time. Need cmake 3.16.0) (disable for the moment)