Re: Text properties slow down XEmacs

JV> Christoph Wedler <wedler(a)fmi.uni-passau.de&gt; writes: JV> Look at what the font-lock does in the end: it ataches faces to JV> regions of the buffer. That sounds like extents to me. JV> That may be implemented now as "regions of chars with certain JV> properties". JV> (Note that the 'add-non-duplicable-text-properties' in questions is JV> called on regions!) Should that mean, whenever regions come into the game, extents are more appropriate? Text props don't have any chance then... ;-) JV> $ a = \alpha + \int d f $ JV> [ -- math face --- ] JV> [ sy ] [sy] I admit it would be nice to have a font-lock like package that handles syntactical structures in this way (we could also set highlight extents and maps and so on...), but the point is: font-lock does not work this way. JV> I am a bit worried about being able to support the 'append keywords JV> efficiently. Exactly, the same for 'prepend. BTW, you get also problems for OVERRIDE = nil, t or keep. Conclusion: using ("real") extents would be nice, but would change font-lock fundamentally. - Christoph