1. Start with "Snap on grid" as the only selected snap option
2. Start to draw a line by clicking.
3. Click on "Free snap". Now both icons "Free snap and "Snap on grid" are selected.
Bug: In this mode snapping works only on grid points, no free snapping is possible. A grid point should only be snapped to when the mouse cursor is within near distance from the grind point. When the mouse cursor is somewhere between the grind points free snapping should apply.
If this is to hard to implement in the moment, the selection of "Snap on grid" and "Free snap" have to be mutually exclusive because they dont work together.
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