Re: [VETO] Revert buffer patch

>>>>> "Andy" == Andy Piper <andy(a)xemacs.org&gt; writes: Andy> I still think we are actually missing a function, something Andy> like `refresh-buffer', since revert-buffer is too Andy> fierce. How about `sync-buffer' for the name? "Refresh" implies display properties to me, ie, redoing all the expensive operations (fontlock, semantic parsing) for the whole buffer. Exactly what you don't want. For implementation, try something rsync-like and only revert those regions of the buffer with actual changes. Since AFAIK font-lock is line-oriented, a diff with a temporary file (buffer image) and a merge in Lisp should be satisfactory. Since the diff is used immediately, no context is needed, this should be only a few lines of Lisp to parse and execute a non-context-diff patch. It would probably make sense to look at font-lock with a view to optimizing line-oriented changes. But now you've got several file i/o operations to worry about. And this function might be called on non-text buffers, where diff may do crazy things. Getting this right would be tricky.

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