Custom Background stretch

With update 2019.06-1 (2019.07-1 too) custom background is not stretched and on unproportional background I can see black edges.

The background images should be provided in the aspect ratio of the screen resolution: 16:9.

That’s something new? Becase older versions works correctly with my wallpapers until now.

Yes. Because of the individual background options and a change in the way the background is handled in dialogs, it made more sense to show backgrounds with the original image aspect ratio.