Wrong auto-scale with two curves assigned to two different ranges

1. Open the project wrong_auto_scale_multi_ranges.lml
2. there are two histograms assigned to two different range:

3. Doing "auto-scale" resizes the second y-range also to 0-20 even though the second histogram goes to y_max = 1.0 only:

When determining min and max values for the ranges we only need to consider curves that are assigned to the ranges.