NSTextView actions

[Fred Kiefer]

Hi Alexander,

you are making great progress with the new text system. Still there is a 
lot to do and test. Have you ever used the Ink example to display any 
bigger RTF files? There you can see that the new code to format text is 
a lot (factor 10 I would say) slower than the old one, which never was 
very fast. As this was the biggest problem with the old code all of us 
should have a go on performance as soon as you consider the new text 
system as feature complete. I did some measurements (see my old mail on 
profiling) and it looks like GSLayoutManager_run_for_glyph_index uses up 
most of the time. Skip lists are normally a rather fast, so there might 
be another problem here. Another place for improvements would be the 
linear seach inside of the line fragments (and text containers, but this 
to a lesser extend).

Also some of your cation methods look plain wrong to me. For the ligatur 
and kering methods you don't call beginEdit and EndEdit on the text 
storage. That way the layout manager would not hear about that changes. 
We don't use this methods in the moment, but still it should be 
corrected. I don't want to touch any code here myself, as this might 
disturb your work.

Cheers
Fred