bug#68364: Print log buttons fail with vc-log-mergebase

[Dmitry Gutov <dmitry@gutov.dev>]

Hi Juri,

On 10/01/2024 09:28, Juri Linkov wrote:
> Buttons to show more log entries is a nice feature,
> but after the recent change this doesn't work with
> 'C-x v M L' (vc-log-mergebase):
> 
>    Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p "branch-2")
>      vc-print-log-setup-buttons("branch-1" t "branch-2" nil)
> 
> Probably it requires a special handling for 'C-x v M L'.

Does this help?

Looks like the description of the LIMIT argument wasn't updated in the 
vc-print-log-internal's docstring, when it started to be a string sometimes.

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index b8cc44fc3dc..7d5a5486250 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -2711,7 +2711,7 @@ vc-print-log-setup-buttons
    ;; In either case only one revision is wanted, no buttons.
    (when (and limit (not (eq 'limit-unsupported pl-return))
               (not (and is-start-revision
-                       (= limit 1))))
+                       (eql limit 1))))
      (let ((entries 0))
        (goto-char (point-min))
        (while (re-search-forward log-view-message-re nil t)