ediff-skip-diff-region-function

ediff-skip-diff-region-function is a variable defined in `ediff-init.el'.
Its value is

ediff-show-all-diffs

• Automatically becomes permanently buffer-local when set.
• This variable may be risky if used as a file-local variable.

Documentation:
Function that determines the next/previous diff region to show.
Should return t for regions to be ignored and nil otherwise.
This function gets a region number as an argument. The region number
is the one used internally by Ediff. It is 1 less than the number seen
by the user.