Bug#924049: fix for the bug

Sun Jul 14 10:22:12 BST 2019

I found out a solution to this problem by studying gnome-control-center
source code. it looks for an application which has support for
"text/calendar" mime:

https://github.com/GNOME/gnome-control-center/blob/master/panels/info/cc-info-default-apps-panel.c#L167

the solution is as following - from the command line, enter the following
command

gio mime text/calendar org.gnome.Calendar.desktop

voila! you can now see gnome-calendar in the control center and it is the
default one

no idea if this matters, but I did it as regular user (non-root, no sudo)

-- 
pozdrawiam serdecznie,
Mateusz Mikołajczyk, a.k.a. toudi
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