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2b1fbf90aa
ee66e08 (gitk: Make updates go faster, 2008-05-09) implemented an
optimized mode where gitk parses the arguments with rev-parse, and
manually reads history in chunks. As mentioned in the commit message,
symmetric differences are a problem there:
One wrinkle is that we have to turn symmetric diff arguments (of the
form a...b) back into symmetric diff form so that --left-right still
works, as git rev parse turns a...b into a b ^merge_base(a,b).
However, git-rev-parse returns a...b in the swapped order
b a ^merge_base(a,b)
This has been the case since at least 1f8115b (the state of master at
the time of the abovementioned ee66e08; Merge branch 'maint',
2008-05-08). So gitk flipped the sides of symmetric differences
whenever it was in optimized mode.
Fix this by swapping the sides of the reconstruction code.
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Paul Mackerras <paulus@samba.org>