Comment 19 for bug 1772520
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#19 |
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This bug exemplifies a couple of problems.
Bug 34420 addresses most of the needs here. But there is also something wrong with the font. When creating ligatures it is necessary to associate the ligature with all (well the first and last) of the underlying glyphs. Thus a rule (taken from MagyarLinLibert
unicode(0x005C) p("a") p("l") p("p") p("h") p("a") > _ _ _ _ _ unicode(0x03B1);
needs to become:
unicode(0x005C) p("a") p("l") p("p") p("h") p("a") > _ _ _ _ _ unicode(0x03B1):(1 6);
This then tells the engine that the whole string \alpha is associated with the one output glyph rather than saying that it is deleting \alph and associating the alpha with the final a only.
Bug 34420 removes the most egregious problems with not specifying appropriately, but doesn't solve everything.
In addition there is the issue that people don't really want to have to right arrow 6 times to get past the alpha, which the current cursor tracking algorithm, which is based on a purely codepoint based (UAX#29) model, requires.