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/relnotes/next	Thu Dec 03 17:18:49 2020 +0530
+++ b/relnotes/next	Wed Dec 09 18:31:19 2020 -0800
@@ -20,6 +20,9 @@
  * `hg strip`, from the strip extension, is now a core command, `hg
    debugstrip`. The extension remains for compatibility.
 
+ * `hg diff` now supports `--from <rev>` and `--to <rev>` arguments as
+   clearer alternatives to `-r <revs>`.
+
  * The memory footprint per changeset during pull/unbundle
    operations has been further reduced.