(emacs.info) Fine Points of Emerge

Info Catalog (emacs.info) Combining in Emerge (emacs.info) Emerge
 
 Fine Points of Emerge
 ---------------------
 
    During the merge, you mustn't try to edit the A and B buffers
 yourself.  Emerge modifies them temporarily, but ultimately puts them
 back the way they were.
 
    You can have any number of merges going at once--just don't use any
 one buffer as input to more than one merge at once, since the temporary
 changes made in these buffers would get in each other's way.
 
    Starting Emerge can take a long time because it needs to compare the
 files fully.  Emacs can't do anything else until `diff' finishes.
 Perhaps in the future someone will change Emerge to do the comparison in
 the background when the input files are large--then you could keep on
 doing other things with Emacs until Emerge is ready to accept commands.
 
    After setting up the merge, Emerge runs the hook
 `emerge-startup-hook' ( Hooks).
 
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