I'm not certain if there's still much of a point in filing bug reports for Qt4,
so I'll just mention the issue I ran into yesterday here.
I've been using Harfbuzz text rendering on Mac, and started getting crashes
with certain content after I upgraded the harfbuzz library to 1.7.6 .
I traced the crash to an out-of-boundary issue at the end of
src/3rdparty/harfbuzz/src/harfbuzz-shaper.cpp, apparently because the function
gets called with an item that has length=0.
I cannot say I understand the context, nor why this could happen when Qt4
apparently uses its own harfbuzz copy, but the issue is reproducible and can be
avoided with this workaround:
Note that harfbuzz support is always built in, but either always active
(`configure -harfbuzz`) or activatable with QT_ENABLE_HARFBUZZ=1 .
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