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Ediff is great!!!
It can’t even show white space differences
Depends on the configured diff program and its options.
This has nothing to do with the diff program. Ediff is not able to highlight whitespace differences like it highlights non-whitespace differences. Maybe it is possible to do somehow, but by default, whitespace differences generate a diff region with no highlights (or as ediff calls it, refinements).
It is because highlights are done on word level, and whitespaces are not words.
Also very basic, IMO:
g X
- go to buffer X’s pointj
- jump to diff number (prefix arg)!
- update (re-diff)C-l
- recenter*
- refine current region#
- ignore whitespace diffs