Suggestion to speed up NSTextView

[Yen-Ju Chen]

Hi,

 After spending a lot of time to speed up the CodeEditor,
 I have a suggestion which might help to speed up NSTextView.
 Current implementation of text system work well when attributes don't 
change a lot.
 If attributes change a lot, the glyph generation is pretty slow.

 There is a [NSLayoutManager -isValidGlyphIndex:] in Cocoa but not in 
GNUstep.
 If NSLayoutManager can check the validation of glyph index without 
generating glyph,
 it will speed GSHorizontalTypesetter a lot (more than twice).

 Since glyph generation depends on backend, I have no idea whether it is 
doable.
 But in xlib, glyph is equal to character, I guess it is not hard to make 
it work.

 The faster CodeEditor is in CVS if you want to try.

 Have fun

 Yen-Ju

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