A single glyph on screen can consist of multiple code points.
What LibreOffice basically does, or tries to do at least, is follow
http://unicode.org/reports/tr29/ and it should work like so...
a) The cursor keys skip over a full grapheme
b) A "delete" deletes a full grapheme
c) A backspace however, chips away a single codepoint at a time
d) A alt+cursor key moves a single code-point at a time
Which is all very well and good, but when we move a single code-point into a glyph our cursor positioning is fairly rubbish and not very helpful.
The bengali KA+HALANT+TTA+HALANT+RA, i.e. 5 codepoints gives "ক্ট্র" which is a good example of this.
I've no idea if there's any handy foo in opentype for determining the correct cursor position inside a gsub'ed glyph. Even if there is/isn't. It'd be nice to come up with...
a) a better calculation for the cursor position in these gsub'ed cases
b) a better cursor itself for helping out when trying to dig into a combining sequence.
I saw a lovely demo of something like this from SIL, perhaps it was a WorldPad demo or something of that nature (http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=WorldPadDownload)
*** Bug 42324 has been marked as a duplicate of this bug. ***
I'm marking this to block rtl-meta bug at it affects also on RTL languages (see bug 42324).
OpenType’s GDEF table can have so ligature carets values that specify the horizontal cursor positions inside a ligatures (so not as sophisticated as the Graphite one, though I think Graphite2 dropped support for that), but very few fonts include this. What applications like Firefox do is to simply divide the width the ligature on the number of its characters.
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So though we are using single glyphs in the document area, the input fields in the find toolbar and find & replace dialog are using single codepoints.
So alt+cursor key moves by single code-points, but alt+shift+cursor key doesnt allow you to select single code-points.
Reporter/others: Please try specifying conditions under which you would consider this bug resolved, and/or reproducible behavior which is not good enough (including how the cursor looks, hopefully with screenshots or photoshopped screenshots).