`git prune --worktrees` was pruning worktrees which were non-existent OR
expired, while it rather should prune those which are orphaned AND
expired, as git-checkout documentation describes. Fix it.

Add test 'not prune proper checkouts', which uses valid but expired
worktree.

Modify test 'not prune recent checkouts' to remove the worktree before
pruning - link in worktrees still must survive. In older form it is
useless because would pass always when the other test passes.

Signed-off-by: Max Kirillov <m...@max630.net>
---
 builtin/prune.c                   | 10 +++++++---
 t/t2026-prune-linked-checkouts.sh | 12 ++++++++++++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/builtin/prune.c b/builtin/prune.c
index 34a5ce1..fd31485 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -120,11 +120,15 @@ static int prune_worktree(const char *id, struct strbuf 
*reason)
                if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
                    st_link.st_nlink > 1)
                        return 0;
-               strbuf_addf(reason, _("Removing worktrees/%s: gitdir file 
points to non-existent location"), id);
-               return 1;
+               if (st.st_mtime <= expire) {
+                   strbuf_addf(reason, _("Removing worktrees/%s: gitdir file 
points to non-existent location"), id);
+                   return 1;
+               } else {
+                   return 0;
+               }
        }
        free(path);
-       return st.st_mtime <= expire;
+       return 0;
 }
 
 static void prune_worktrees(void)
diff --git a/t/t2026-prune-linked-checkouts.sh 
b/t/t2026-prune-linked-checkouts.sh
index e885baf..1821a48 100755
--- a/t/t2026-prune-linked-checkouts.sh
+++ b/t/t2026-prune-linked-checkouts.sh
@@ -4,6 +4,10 @@ test_description='prune $GIT_DIR/worktrees'
 
 . ./test-lib.sh
 
+test_expect_success initialize '
+       git commit --allow-empty -m init
+'
+
 test_expect_success 'prune --worktrees on normal repo' '
        git prune --worktrees &&
        test_must_fail git prune --worktrees abc
@@ -77,8 +81,16 @@ test_expect_success 'not prune recent checkouts' '
        mkdir zz &&
        mkdir -p .git/worktrees/jlm &&
        echo "$(pwd)"/zz >.git/worktrees/jlm/gitdir &&
+       rmdir zz &&
        git prune --worktrees --verbose --expire=2.days.ago &&
        test -d .git/worktrees/jlm
 '
 
+test_expect_success 'not prune proper checkouts' '
+       test_when_finished rm -r .git/worktrees &&
+       git checkout "--to=$PWD/nop" --detach master &&
+       git prune --worktrees &&
+       test -d .git/worktrees/nop
+'
+
 test_done
-- 
2.3.4.2801.g3d0809b

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