Comment 40 for bug 1583088

Here is what Qt is doing, on upload:
https://code.woboq.org/qt5/qtdeclarative/src/quick/scenegraph/qsgdefaultdistancefieldglyphcache.cpp.html#158
It saves & restores the alignment, and assumes the default alignment of 4 for drawing. IMO Mir isn't playing along, as it changes the alignment but does not restore it.