Clipping of VF glyphs, in previews and pdf (could be OS issue)

[LettError]

This could be an OS issue but it may be useful to have a report of it here.

• Using Drawbot Version 3.122 on Macos 10.15.1, glyphs from a variable font, MutatorSans.ttf appear clipped in previews and pdf exports.
• When the same data is exported to gif the shapes are not clipped.
• Also observed with the same OS and Drawbot versions with different a different VF.
• Using the same ttf in axis-praxis.org with Safari Version 13.0.3 (15608.3.10.1.4) shows no clipping.

Screengrab of the clipping while changing axis values:

weightMin = listFontVariations('MutatorMathTest')['wght']['minValue']
weightMax = listFontVariations('MutatorMathTest')['wght']['maxValue']
widthMin = listFontVariations('MutatorMathTest')['wdth']['minValue']
widthMax = listFontVariations('MutatorMathTest')['wdth']['maxValue']

txt = '→F'

def ip(a, b, f):
    return a + f*(b-a)

newPage(820, 310)
font("MutatorMathTest")
fontSize(280)
weightValue = ip(weightMin, weightMax, 701/1000)
widthValue = ip(widthMin, widthMax, 813/1000)
fontVariations(wght=weightValue, wdth=widthValue)
text(txt, (20, 50))

saveImage("clipped.pdf")
saveImage("not-clipped.png")

Result images:

• png export without clipping

• pdf with clipping clipped.pdf