commit: if interactive, look elsewhere for whitespace settings (BC)
Previously, when doing `commit -i`, we respected `diff.ignorews` and other
whitespace-related settings, which is probably unexpected. The primary reason
for this is to support hgext.record's commandline options, it's probably
accidental that the `[diff]` settings were also considered. See comments on
issue6042 and D5490. This can cause problems (issue5839, issue6042).
It is assumed by the author that the `[diff]` section is primarily for *viewing*
diffs, and that it is unlikely what people intend when attempting to commit or
revert.
With this change, if a user wants the behavior, they can clone their `[diff]`
settings to `commands.commit.interactive.<setting>`. This is thus a mild BC
change, but one I suspect is not going to be relied on by anyone.
Note: while doing a partial commit/revert, we do not know what command the user
is actually running. This means that the split extension, which ends up calling
into this code, will respect the `commands.commit.interactive.<setting>`
settings, and not a hypothetical `commands.split.interactive.<setting>`. This
*also* means that setting `commands.commit.interactive.ignoreblanklines`, for
example, will still cause issue5839. Considering the highly unlikely chance that
a user actually sets `commands.commit.interactive.<setting>`, the author deems
this risk acceptable.
Differential Revision: https://phab.mercurial-scm.org/D5834
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