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Closes #1392

(cherry picked from commit eb439f82)

(cherry picked from commit be5c1792)

The error arguments are counted from 0 and there was no '0' argument,
which caused a runtime warning and an incomplete error message in the GUI.

Not doing so aborts the application, which is not intended here.

(cherry picked from commit 536267e1)

The protected headers can be included also under the multipart/signed part,
not only directly under the encrypted part.

Closes #1475

Discovered by static analyzers.

(cherry picked from commit bb9b3f4c)

Closes #1475

Related to evolution-data-server#329
Related to evolution-etesync#10

Closes #1474

Closes #1471

(cherry picked from commit 19f35b8e)

Closes #1460

Closes #1467

Closes #1462

(cherry picked from commit dad0dd2b)

Closes evolution-data-server!68

(cherry picked from commit 55170869)

The function issues an on-idle callback using the editor, which can
be freed before the idle callback is called. Use GWeakRef to know
whether the editor was freed meanwhile or not.

(cherry picked from commit f1ce1115)

Closes #1459

CMake 3.20.1 errors out with:

CMake Error at cmake/modules/PrintableOptions.cmake:38 (message):
   variable name cannot be empty
 Call Stack (most recent call first):
   CMakeLists.txt:152 (add_printable_variable)

Change how the parameter value is compared, to fix it.

(cherry picked from commit 2e3bf3a6)

(cherry picked from commit ac7d54f4)

(cherry picked from commit ab750c51)

(cherry picked from commit a52ca60c)

The recurrence ID should not be used when deleting all instances,
otherwise the views might not receive the notification about
the removal, due to the used instance is not part of the view, but,
more importantly, all instances do not have the recurrence ID set.

Closes #1292

(cherry picked from commit 09eb471c)