Instead of setting always manually the step and page increments when
creating a GimpScaleEntry, let's just generate some common cases
automatically. Indeed the increments are rarely something you want to
care about. The algorithm used is:
- For a range under 1.0, use a hundredth and a tenth (typically a [0,
1.0] range will step-increment of 0.01 and page-increment of 0.1).
- For small ranges (under 40), step-increment by 1, page-increment by 2.
- For bigger ranges, step-increment by 1, page-increment by 10.
For use cases when you absolutely want specific increment values, I add
the gimp_scale_entry_set_increments() function. It is much better to
have a small and understandable constructor call followed by
configuration calls (only when needed) rather than a constructor with a
crazy amount of parameters. Hence gimp_scale_entry_new() went from 17
arguments (absolutely unreadable calls) to now 5.
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