[PATCH v2 1/3] mergetools/p4merge: swap LOCAL and REMOTE

Reverse LOCAL and REMOTE when invoking P4Merge as a mergetool, so that the incoming branch is now in the left-hand, blue triangle pane, and the current branch is in the right-hand, green circle pane.

This change makes use of P4Merge consistent with its built-in help, its reference documentation, and Perforce itself. But most importantly, it makes merge results clearer. P4Merge is not totally symmetrical between left and right; despite changing a few text labels from "theirs/ours" to "left/right" when invoked manually, it still retains its original Perforce "theirs/ours" viewpoint.

Most obviously, in the result pane P4Merge shows changes that are common to both branches in green. This is on the basis of the current branch being green, as it is when invoked from Perforce; it means that lines in the result are blue if and only if they are being changed by the merge, making the resulting diff clearer.

Note that P4Merge now shows "ours" on the right for both diff and merge, unlike other diff/mergetools, which always have REMOTE on the right. But observe that REMOTE is the working tree (ie "ours") for a diff, while it's another branch (ie "theirs") for a merge.

Ours and theirs are reversed for a rebase - see "git help rebase". However, this does produce the desired "show the results of this commit" effect in P4Merge - changes that remain in the rebased commit (in your branch, but not in the new base) appear in blue; changes that do not appear in the rebased commit (from the new base, or common to both) are in green. If Perforce had rebase, they'd probably not swap ours/theirs, but make P4Merge show common changes in blue, picking out our changes in green. We can't do that, so this is next best.

Signed-off-by: Kevin Bracey <kevin@bracey.fi>
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 mergetools/p4merge | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)