Fuse.Text: make sure emoji respect text-color alpha
Fuse.Text: make sure emoji respect text-color alpha

This fixes #966 when using the HarfBuzz renderer.

nekronos/fuselibs-public,yupferris/fuselibs-public,eksperts/fuselibs-public,kusma/fuselibs-public,eksperts/fuselibs-public,fusetools/fuselibs-public,eksperts/fuselibs-public,yupferris/fuselibs-public,cbaggers/fuselibs-public,yupferris/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,nekronos/fuselibs-public,yupferris/fuselibs-public,nekronos/fuselibs-public,cbaggers/fuselibs-public,kusma/fuselibs-public,kusma/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,eksperts/fuselibs-public,nekronos/fuselibs-public,nekronos/fuselibs-public,eksperts/fuselibs-public,cbaggers/fuselibs-public,kusma/fuselibs-public,fusetools/fuselibs-public,yupferris/fuselibs-public,nekronos/fuselibs-public,yupferris/fuselibs-public,kusma/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,yupferris/fuselibs-public,kusma/fuselibs-public,eksperts/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,kusma/fuselibs-public,nekronos/fuselibs-public,eksperts/fuselibs-public,fusetools/fuselibs-public