Hello,
I've just tested, one after all, programs of main graphics libraries
families to see if it improved since the last time I did so. And it did.
However something that stroke me is the lack of consistency in the way
cursor and delete/backspace keys behave, especially when considering
consonant clusters.
Qt and basic KDE applications treat clusters as single graphemes when
moving cursor, they use <backspace> to delete one Unicode character and
<delete> to delete the entire cluster. In Kate, <delete> deletes only
one Unicode character, even in clusters, resulting in isolated viramas
or matras. In KWord, both <backspace> and <delete> delete the entire
cluster. OpenOffice.org and Firefox treat clusters as a list of
{consonant,virama} couples with an optional matra for the last one,
sometimes resulting in very disturbing cursor positioning (in the middle
of a character), or in giving the impression that you have selected a
whole cluster while in reality you only have a part of it in the copy
buffer (you can also type text in the middle of a cluster in a totally
unintended way), or you can even have the cursor moving to the right
when pressing <left>.
A real mess!
So my question is : is there any more or less official standard about
cursor and delete/backspace behavior ?
Unicode has the
http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries page
which suggests something very close to what Qt does, but it's not
written as a standard you're supposed to follow but more as mere
suggestions and examples.
It seems to me that Qt, at least for scripts which have complex
consonants clusters (I agree Devanagari and Tamil may deserve different
treatments), is the only one behaving the right way, and OpenOffice.org
and Firefox are the most broken. But it would be nice to know what is
supposed to be "the right way".
Regards,
--
Bernard Massot
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