diff tests/test-completion.t @ 46087:64292addbe67

diff: add --from and --to flags as clearer alternative to -r -r

I think it was mistake to let the `-r` flag accept two revisions in
`hg diff` in 98633e60067c (Support for 0, 1, or 2 diff revs,
2005-05-07). The command clearly acts on two revisions and having a
single flag to indicate which those are is unclear. It got worse when
it started accepting revsets as input.

This patch introduces `--from` and `--to` flags, each taking a single
revision and each defaulting to the working copy. That means that `hg

--- a/tests/test-completion.t	Thu Dec 03 17:18:49 2020 +0530
+++ b/tests/test-completion.t	Wed Dec 09 18:31:19 2020 -0800
@@ -333,7 +333,7 @@
   debugwhyunstable: 
   debugwireargs: three, four, five, ssh, remotecmd, insecure
   debugwireproto: localssh, peer, noreadstderr, nologhandshake, ssh, remotecmd, insecure
-  diff: rev, change, text, git, binary, nodates, noprefix, show-function, reverse, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, unified, stat, root, include, exclude, subrepos
+  diff: rev, from, to, change, text, git, binary, nodates, noprefix, show-function, reverse, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, unified, stat, root, include, exclude, subrepos
   export: bookmark, output, switch-parent, rev, text, git, binary, nodates, template
   files: rev, print0, include, exclude, template, subrepos
   forget: interactive, include, exclude, dry-run