On Sat, 9 Feb 2019 18:42:52 +0100 Egmont Koblinger via Unicode <unicode@unicode.org> wrote:
> The > problem that I don't know how to address is: What if harfbuzz tells us > that the overall width for rendering a particular grapheme cluster is > significantly different from its designated area (the number of > character cells [wcswidth()] multiplied by the width of each)? You have to reduce the width of the glyph used. The tricky bit is where the glyph deliberately overhangs or underlies a neighbouring glyph. A good example of this is almost U+0E33 THAI CHARACTER SARA AM, whose nikkhahit component can typically overhangs the previous character; however, ink beyond the left limit should not be a problem for LTR scripts. Which side do you align RTL cells on? Now, you might want to treat U+0E33 as interacting with its predecessor, because it does. The test word is น้ำ 'water'. Richard.
