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In the keyboard shortcuts, Layer folder, there are the ones for each blending mode but I didn't find a way to choose the previous/next blending mode
It would be very convenient to be able to scroll through this way, to see the result at a glance.

Also there are a couple of "Basculer entre les actions" left in the english localization.

Huh, yes, we should have this. I'll add it for v12.0.3.

About the "Basculer", I'll have a look as well.