Make f ligatures slightly wider under Quasi-Proportional.

[jmcwilliams403]

Rather than treating the widths as two to three advanceScaleII-width sub-characters adding up to one 1 or advanceScaleMM width composite character respectively, this instead calculates it the other way around, starting with advanceScaleMM or [mix 1 advanceScaleMM 2] and then multiplying it by advanceScaleF, which results in a more accurate approximation of two to three advanceScaleF characters, which, while effectively wider than before, also allows it to be sensitive to the different f metrics enforced by quasi-proportional-extension-only.

ffffiffiflffl
affect affect
infinite infinite
office office
inflect inflect
affluent affluent

Aile Thin Before:

Aile Thin After:

Aile Regular Before:

Aile Regular After:

Aile Heavy Before:

Aile Heavy After:

Etoile Thin Before:

Etoile Thin After:

Etoile Regular Before:

Etoile Regular After:

Etoile Heavy Before:

Etoile Heavy After: