fix: ask again for a tip older than the pin

A branch tip is cached for six hours. scummvm-standalone was pinned on
6f7b060d while the cache still held 77d80d7, its ancestor, so profile_sync
showed a HEAD behind the pin and a bump would have moved it backwards. A
tip that is a strict ancestor of the pin is now asked for again.

scripts/profile_sync.py

@@ -1141,6 +1141,13 @@ def select_views(
             continue
         if not head:
             continue
+        if head != pin and not offline:
+            # A tip cached before the pin was written is older than the pin:
+            # scummvm-standalone pinned 6f7b060d while the cache still held
+            # 77d80d7, and a bump would have moved the pin backwards.
+            relation = upstream.ancestry(repo, pin, head, cache_dir, offline)
+            if relation and relation[0] == 0 and relation[1] > 0:
+                head = upstream.resolve_head(repo, cache_dir, offline, branch, fresh=True) or head
         seen.add((repo.host, repo.slug))
         views.append(RepoView(repo, pin, head, origin, field))
     if gone and not views:

scripts/upstream.py

@@ -527,16 +527,18 @@ def current_slug(repo: Repo, cache_dir: str, offline: bool = False) -> str | Non
 
 
 def resolve_head(
-    repo: Repo, cache_dir: str, offline: bool = False, branch: str | None = None
+    repo: Repo, cache_dir: str, offline: bool = False, branch: str | None = None,
+    fresh: bool = False,
 ) -> str | None:
     """Sha of a branch tip, the default branch unless one is named.
 
     A libretro port often lives on a branch of a fork rather than on the
     default branch, so the code a profile documents can be absent from the
-    tip the forge serves by default.
+    tip the forge serves by default. ``fresh`` asks the forge again whatever
+    the cache holds.
     """
     return _first_sha(
-        _api(_commits_url(repo, None, branch), cache_dir, offline, MOVING_TTL)
+        _api(_commits_url(repo, None, branch), cache_dir, offline, 0 if fresh else MOVING_TTL)
     )