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It seems you can't scroll textarea using JS in Opera. - scrollTop
ignored. Seems the only way to keep appended content within view is to
remove enough content from start so that it will all fit. And here we
come to the tricky part, counting real physical lines occupied by text,
so we could know if there's still need to trim or not. Considering
linewraps, tabs, newlines, possibly scalable fonts, possibly scalable
textarea itself...

My try at the problem. http://www.kurs.horsesport.pl/inne/testcase.html
Of course it's broken (otherwise I wouldn't ask). I guess I could add
support for counting tabs, and given a reliable column count even
reliably estimate differences coming from word wrap but I'm completely
stumped when it comes to counting width and height with at least
moderate reliablity. (I know Opera gets them wrong, any workarounds?)

Any ideas, suggestions, solutions?