[fix-nonhinting] Changing maxp maxSizeOfInstructions when adding prep table

[kalapi]

Hello!

I'd like to preface this by saying that i'm unsure whether or not this needs to be implemented/fixed, but since the maxp table handles memory requirements I was thinking that it might be important to get right.

Issue description

When I run gftools fix-unhinted a prep table is added to the font but the maxSizeOfInstructions remains unchanged. The prep table generated for me has 7 lines(bytes) of instructions and thus this should reflect in the maxp table

Interested to know your thoughts and thanks in advance for your help!

[simoncozens]

the maxp table handles memory requirements

Does it, though? :-) I mean, historically, perhaps. But these days I don't know if any TrueType implementations are going to barf because the maxSizeOfInstructions is wrong. Worth noting that font["maxp"].recalc() in fontTools computes everything apart from the maxSizeOfInstructions.