hg-core: Explain offset override of first revision
(D8958#inline-14992 followup)
Differential Revision: https://phab.mercurial-scm.org/D9095
--- a/rust/hg-core/src/revlog/index.rs Mon Sep 28 13:46:14 2020 +0200
+++ b/rust/hg-core/src/revlog/index.rs Mon Sep 28 13:51:16 2020 +0200
@@ -98,7 +98,8 @@
let end = start + INDEX_ENTRY_SIZE;
let bytes = &self.bytes[start..end];
- // See IndexEntry for an explanation of this override.
+ // Override the offset of the first revision as its bytes are used
+ // for the index's metadata (saving space because it is always 0)
let offset_override = match rev {
0 => Some(0),
_ => None,