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While viewing any type of file which larger then ~2000 lines, I see artifacts. This happens on Ubuntu , but I also saw such behavior on Win 7, so it's not OS related issue. Also seen same on NB7. Looks like some internal buffer is not capable to handle big files. And as You can see on the second screenshot, aprox. in the middle of the file it just stops to corrupt file view.
Created attachment 110012 [details] editor artifacts
Created attachment 110013 [details] half view is normal
I cannot reproduce on NB 7.1 Beta. There used to be the painting artifacts problems in 6.9.1 but they should now be fixed. If the problem would persist in NB 7.1 Beta please reopen the issue.
Just checked NB 7.1b, looks like it's fixed as I don't see artifacts anymore. Confirming it's fixed, at least WORKSFORME.