[nongnu] elpa/magit b2a4da4df2 4/5: magit-insert-recent-commits: Only use explicit range with --graph

[Jonas Bernoulli]

branch: elpa/magit
commit b2a4da4df27048c271cb341a6b4b60658d0469a1
Author: Jonas Bernoulli <jonas@bernoul.li>
Commit: Jonas Bernoulli <jonas@bernoul.li>

    magit-insert-recent-commits: Only use explicit range with --graph
    
    Since [1: 55a61d15e8] we use an explicit range "HEAD~<N>..HEAD" in
    addition to "-n<N>", for a massive speedup when using "--graph".
    
    When not using "--graph", then that actually results in a (smaller)
    slowdown, so stop doing it in that case.
    
    When `core.commitGraph' is enabled (the default) and an up-to-date
    commit-graph file exists (it usually does not), then we could always
    omit the range, but it wouldn't make much of a difference in that case.
    
      core.commitGraph=false               -n10                      0.557
      core.commitGraph=false                    HEAD~10..HEAD        1.613
      core.commitGraph=false               -n10 HEAD~10..HEAD        1.569
      core.commitGraph=false    --graph    -n10                      63.776
      core.commitGraph=false    --graph         HEAD~10..HEAD        1.555
      core.commitGraph=false    --graph    -n10 HEAD~10..HEAD        1.500
    
      core.commitGraph=true                -n10                      0.545
      core.commitGraph=true                     HEAD~10..HEAD        0.688
      core.commitGraph=true                -n10 HEAD~10..HEAD        0.630
      core.commitGraph=true     --graph    -n10                      0.542
      core.commitGraph=true     --graph         HEAD~10..HEAD        0.598
      core.commitGraph=true     --graph    -n10 HEAD~10..HEAD        0.491
    
    Also see #5075.
    
    1: 2015-09-07 55a61d15e85fe46409e512cc60815e61b4843066
       avoid `git log --graph' inefficiency
---
 lisp/magit-log.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/magit-log.el b/lisp/magit-log.el
index f2a70ca24a..6c304d00b6 100644
--- a/lisp/magit-log.el
+++ b/lisp/magit-log.el
@@ -1955,7 +1955,8 @@ Show the last `magit-log-section-commit-count' commits."
                            (or value range)
                            t)
       (magit-insert-heading "Recent commits")
-      (magit--insert-log nil range
+      (magit--insert-log nil
+        (and (member "--graph" magit-buffer-log-args) range)
         (cons (format "-n%d" magit-log-section-commit-count)
               (--remove (string-prefix-p "-n" it)
                         magit-buffer-log-args))))))