On 11/10/2024 23:28, Dmitry Gutov wrote:
> 
> Anyway, it seems instead of vc-root-diff we can use vc-diff-mergebase, 
> it has the same completion for revisions. With REV1=@{upstream} and 
> REV2="", we'll get #1, with reverse - #2. The full key sequence:
> 
>    C-u C-x v M D @{upstream} RET C-j
> 
> Note that vc-*-mergebase is only implemented for Git. But vc-hg-log- 
> incoming is defined -- that seems to indicate that 'mergebase' would be 
> useful to support for it too.

Here's my current patch.