Range area fixes for curve types: straight, stepline, linestep, smooth #4369
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RangeArea fixes for data series with nulls
Together with previously merged changes includes curve types:
straight, stepline, linestep, smooth
Unchanged from previous:
Does not fix the animation glitches due to pathsFrom/pathsTo not handling nulls.
Issues addressed
Fixes #3525
Fixes #3821
Type of change
All the usual tests have passed with these changes, including samples from the bug reports plus my own variants designed to be slightly more stressful for the code.