The change in 8b7e5d76e8, which makes
a couple of git-diff-tree calls supply only one id rather than two,
fixes the display when showing what a single commit did with dense
revlists, but broke the diff this->selected and diff selected->this
right-click menu functions.
Yann Dirson pointed this out and had a patch that fixed the diff
menu functions by passing a "singlecommit" flag around. This fixes
it a bit differently, by making the ids and diffids variables be
either a single id, in the case of showing what a commit did, or
{oldid newid}, in the case of the diff menu functions. That way
we can just pass $ids to git-diff-tree as is. Most of the changes
in fact are just reversing the order of ids in $ids and $diffids,
because they used to be {child parent}, but git-diff-tree requires
old id before new id.
Signed-off-by: Paul Mackerras <paulus@samba.org>
d327244a84