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As an interim solution I have created three venezian blind icons out of the original Fibaro slider.
They show closed (zu), 50% open and open (auf) - not perfect so maybe somebody can enhance or create better ones?
To have a better recognition I would love to see all icons from the side (such as the 50% one): one closed, one 50% and one open. Actually my 50% one should be the one which shows 100% open...