4ddc1118bb
To work around a problem where libcroco < 0.6.2 can't handle functions starting with 'r' or 'u', preconvert 'rgba' to 'RGBA' when parsing stylesheets and then check for rgba() case-insensitively. (libcroco is uniformly case-sensitive, though the CSS spec requires that ASCII should be handled case-insensitively.) https://bugzilla.gnome.org/show_bug.cgi?id=597054