Comment # 11 on bug 1190288 from Yifan Jiang

My 2 cents - SP4 is a major version update of desktop and main infrastructures,
so it is a good candidate to update harfbuzz particularly when it has API
changes (not in an ideal way though). It would be great if we find a way to
rebuild the unforked dependencies (starting with libqt5-qtwebengine). 

@Frederic, what do you think, is it realistic?