On Mon, 2020-11-09 at 15:01 +0100, Krauß, Peter (SCC) via evolution-
> I tested this on the latest git version without a problem. Any chance
> this might be accepted if I create a pull request?
sure, chances are high. Just follow the coding style  and place the
change to a place where it makes sense, like there where the actual
window is created, not every time it is shown.
Thanks and bye,