Fix stacked accents for Vietnamese, etc about shantell-sans

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Process

I’m trying this in a branch, just so I can easily back out if it goes wrong.

1. Remove stacked accents from font ... I think there were some pieces of data left over from copying in roboto glyphs, early on

2. Use Glyph Construction to build the stacked accents:

# vietnamese stacked accents

?breveacutecomb = brevecomb + acutecomb@top

?brevegravecomb = brevecomb + gravecomb@top

?brevehookabovecomb = brevecomb + hookabovecmb@top

?brevetildecomb = brevecomb + tildecomb@top

?circumflexacutecomb = circumflexcomb + acutecomb@side

?circumflexgravecomb = circumflexcomb + gravecomb@side

?circumflexhookabovecomb = circumflexcomb + hookabovecmb@side

?circumflextildecomb = circumflexcomb + tildecomb@top


# other stacked accents

?ringacutecomb = ringcomb.A + acutecomb@top

?dieresismacroncomb = dieresiscomb + macroncomb@top

?tildemacroncomb = tildecomb + macroncomb@top

?dotmacroncomb = dotaccentcmb + macroncomb@top

2. Add _top anchors to the new glyphs with a RoboFont script

f = CurrentFont()

for gname in f.selection:
    if "_top" not in [a.name for a in f[gname].anchors]:
        f[gname].appendAnchor("_top", (0, f.info.xHeight))

3. Adjust positioning in stacked accents. Decompose them, to make it simpler (because their design is already settled ... in another family, I would try leaving them as components, and make sure they ran through a build filter to decompose as nested comps).

4. Build stacked glyphs w/ Glyph Construction

Acircumflexacute = A + circumflexacutecomb @ top
acircumflexacute = a + circumflexacutecomb @ top
Acircumflexgrave = A + circumflexgravecomb @ top
acircumflexgrave = a + circumflexgravecomb @ top
Acircumflexhoi = A + circumflexhookabovecomb @ top
acircumflexhoi = a + circumflexhookabovecomb @ top
Ecircumflexacute = E + circumflexacutecomb @ top
ecircumflexacute = e + circumflexacutecomb @ top
Ecircumflexgrave = E + circumflexgravecomb @ top
ecircumflexgrave = e + circumflexgravecomb @ top
Ecircumflexhoi = E + circumflexhookabovecomb @ top
ecircumflexhoi = e + circumflexhookabovecomb @ top
Ocircumflexacute = O + circumflexacutecomb @ top
ocircumflexacute = o + circumflexacutecomb @ top
Ocircumflexgrave = O + circumflexgravecomb @ top
ocircumflexgrave = o + circumflexgravecomb @ top
Ocircumflexhoi = O + circumflexhookabovecomb @ top
ocircumflexhoi = o + circumflexhookabovecomb @ top

Acircumflextilde = A + circumflextildecomb @ top
acircumflextilde = a + circumflextildecomb @ top
Abreveacute = A + breveacutecomb @ top
abreveacute = a + breveacutecomb @ top
Abrevegrave = A + brevegravecomb @ top
abrevegrave = a + brevegravecomb @ top
Abrevehoi = A + brevehookabovecomb @ top
abrevehoi = a + brevehookabovecomb @ top
Abrevetilde = A + brevetildecomb @ top
abrevetilde = a + brevetildecomb @ top
Ecircumflextilde = E + circumflextildecomb @ top
ecircumflextilde = e + circumflextildecomb @ top
Ocircumflextilde = O + circumflextildecomb @ top
ocircumflextilde = o + circumflextildecomb @ top

# Non-Vietnamese Stacks

Aringacute  = A + ringacutecomb@ring # but maybe there should be a ringacutecomb.A connected at "top" instead?
aringacute  = a + ringacutecomb@top
Odieresismacron = O + dieresismacroncomb@top
odieresismacron = o + dieresismacroncomb@top
Otildemacron = O + tildemacroncomb@top
otildemacron = o + tildemacroncomb@top
Odotmacron = O + dotmacroncomb@top
odotmacron = o + dotmacroncomb@top

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After doing the above in the primary 4 sources, and without adjusting the build scripts at all, it builds! And it works quite well:

Screen.Recording.2022-05-07.at.5.06.27.PM.mov