stepGranularity property
The step size in which the font size is being adapted to constraints.
The Text scales uniformly in a range between minFontSize and maxFontSize. Each increment occurs as per the step size set in stepGranularity.
Most of the time you don't want a stepGranularity below 1.0.
Is being ignored if presetFontSizes is set.
Implementation
final double stepGranularity;