#3 ignore space (in merging)

[Uwe Koloska]

It would be nice to have a function that ignores
changes in whitespace completely.

I like the way it is implemented in Emacs ediff-mode:
choose "ignore whitespace differences" and "goto next
diff" skips all whitespace diffs.

For merge it could be implemented as follows:
- as a precondition: if only whitespace difference,
choose (A|B|C)
- as postcondition: (like in xxdiff) select all
unselected from (A|B|C)

so "next diff" and "next conflict" only consider
non-whitespace diffs (if "ignore whitespace" is on) and
the whitespace regions can be automatically selected.

[Joachim Eibl]

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user_id=584435

Implemented in 0.9.80.
New menu-entries:
- Choose A/B/C for all unsolved conflicts.
- Choose A/B/C for all unsolved whitespace conflicts.
- Show White Space
New option:
- White-space 2/3 file merge default.

Thanks for this nice suggestion.