clearLineHeightScaleFactorOverrideTestValue method
Deletes any existing test line height scale factor and returns to using the real line height scale factor.
Implementation
void clearLineHeightScaleFactorOverrideTestValue() {
_lineHeightScaleFactorOverrideTestValue = null;
_forceLineHeightScaleFactorOverrideToBeNull = false;
onMetricsChanged?.call();
}