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(ediff)Narrowing

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Narrowing
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   If buffers being compared are narrowed at the time of invocation of
Ediff, `ediff-buffers' will preserve the narrowing range.  However, if
`ediff-files' is invoked on the files visited by these buffers, that
would widen the buffers, since this command is defined to compare the
entire files.

   Calling `ediff-regions-linewise' or `ediff-windows-linewise', or the
corresponding `-wordwise' commands, narrows the variants to the
particular regions being compared.  The original accessible ranges are
restored when you quit Ediff.  During the command, you can toggle this
narrowing on and off with the `%' command.

   These two variables control this narrowing behavior:

`ediff-start-narrowed'
     If `t', Ediff narrows the display to the appropriate range when it
     is invoked with an `ediff-regions...' or `ediff-windows...'
     command.  If `nil', these commands do not automatically narrow,
     but you can still toggle narrowing on and off by typing `%'.

`ediff-quit-widened'
     Controls whether on quitting Ediff should restore the accessible
     range that existed before the current invocation.