varfont__duplexed_axis_reflow

Ensure VFs with duplexed axes do not vary horizontal advance.

varfont/duplexed_axis_reflow

• Applies to: TTF
• Fontspector can hotfix?: no
• Fontspector can fix sources?: no

Rationale

Certain axes, such as grade (GRAD) or roundness (ROND), should not change any advanceWidth or kerning data across the font's design space. This is because altering the advance width of glyphs can cause text reflow.

Proposal

• https://github.com/fonttools/fontbakery/issues/3187

Profiles

• universal (in section 'Universal Profile Checks')

• googlefonts (in section 'Universal Profile Checks')