> - type two arabic characters that get drawn as a ligature > - draw a series of Vietnamese combining characters as a single glyph > - etc.
I think in the case of the Arabic ligature, these have to be treated as two characters, i.e., pressing backspace after the second one leaves you with the first one. This case is not a real issue, because internally the ligature is stored as two separate characters, ligature is just a way of displaying in them in a way that looks better, it is not a combination character, and it is the responsibility of the shaping engine to do the transformation for drawing on screen, the piece table knows nothing about it -- just try it for yourself with Arabic, AW should handle that quite well :). On the other hand if in Czech I type acute + a, and press backspace, I expect both symbols to disappear because they combination is a single character. In this case it is not an issue, since the acute+a gets stored as a single codpoint, but in some other languages this would be an issue. Tomas
