[HarfBuzz] Backspace and Delete behaviours

[Rajeev J Sebastian]

On Sun, Jul 24, 2011 at 9:00 AM, Behdad Esfahbod <behdad at behdad.org> wrote:
> On 07/23/11 12:06, Rajeev J Sebastian wrote:
>> whereas backspace erases logical characters.
>
> This is vague and wrong.  What's a logical character?  If you simply mean
> Unicode character, then there's a trivial reason for why this is wrong:
> ideally user shouldn't know or care about the difference between NFC and NFD.
>  Backspace, delete, cursor movement, all should ideally work the same with
> NFC, NFD, or any other canonically equivalent Unicode text.
>
> And, one size does not fit all.  For example, Arabic non-spacing marks are
> vowel marks that one would expect to be able to back-space, but say, grave
> accent, or any of the other Latin marks, are diacritic marks, not vowels.
> They simply _modify_ their base, so user expects backspace to delete the mark
> and the base.

Im referring to Indic scripts here.

Regards
Rajeev J Sebastian