a_zero_width_joiner_in_devanagari_asks_for_a_half_form took any
fallback face whose GSUB script list holds dev2 or deva, and then
asserted that Ka takes its half form. A face with the script tag and
no half form for Ka failed the test, although the text was shaped in
the fallback face as the test checks.
The test now takes a fallback face only when the face lists dev2 or
deva and Ka + halant + ZWJ + Ssa set in that face alone starts with
Ka's half form and ends with Ssa. It prints SKIPPED when no installed
face does. A new test runs the filter on two faces built in code that
both list dev2. It takes the face with a half feature and passes
over the face without one.
dotCooCoo