change the minimum of the slide control

[lublak]

Proposed changes

allows to define horizontal grid cells with size "1" which is easier to work with for imsple stack based forms

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[FalkWolsky]

Thank you very much for your contribution!

Initially, we tested the grid system and defined 8 as "sense-making minimum". But we can follow your idea too, and will just merge the changes.

The base branch was changed.

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