don't make the patch buffer RO.
(ediff-load-version-control): now checks if ediff-revision-key is non-nil. (ediff-revision-key): Now defaults to nil. (ediff-revision): now takes prefix argument; can compare two versions of the same file. the merge buffer now assumes the major mode of the default variant. (ediff-documentation: new function. (ediff-patch-buffer): now handles buffers that don't visit any file. (ediff-windows): renamed to ediff-windows-wordwise, added (ediff-windows-linewise): new function. Changed ediff-small/large-regions to ediff-regions-wordwise/linewise Converted xemacs *screen* nomenclature to *frame*. Incorporated overlay strings. Ediff no longer runs under emacs 19.28 and earlier and XEmacs 19.11 and earlier. Changed window-system to ediff-window-display.
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