CSS3121: Die Medienabfrage -ms-viewport ist veraltet. media query ... deprecated

1 
CSS3121: Die Medienabfrage -ms-viewport ist veraltet ,. i.e. media query -ms-viewport  is deprecated.

Running my newest app I noticed that Chrome debugger says: CSS3121: Die Medienabfrage -ms-viewport ist veraltet. I found this query solely within bootstrap-4.0.0.css: @-ms-viewport {
width: device-width;
} . This seems to be all right and correct. Or is there something else to worry about?
Bernd

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What version of AppStudio are you using?

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„Die neueste Version ist 7.2.0.0. Kein Update erforderlich“

4

The reason I asked about the version is that the latest AppStudio uses Bootstrap 4.2 - and this error refers to Bootstrap 4.0.0. Does this file show up under the Sources tab in the Chrome Debugger?

5

Attached is all I could see. Useful?

6

Yes, very useful. Looks there is an update for that theme. We’ll get it into the next build.

7

Excellent. Thanks.
Bernd