fix: keep the two mt32emu.h citations together

Each MT-32 entry cites the SHA-1 line and the ROMInfo line of one
mt32emu.h. dosbox_pure wrote them under two repository words, so the
ROMInfo line was self-checked alone and read MOVED onto the SHA-1 line.
Both now sit in the port that carries the file, and in the upstream for
dosbox-pure-unleashed, whose tree has no src/gui.

A recale that lands on a line a sibling part already cites goes to
review, and a part settled by its anchor keeps that anchor's repository.

tests/test_profile_sync.py

@@ -4158,6 +4158,15 @@ class TestReconcilePerFile(unittest.TestCase):
         result = profile_sync.reconcile_self_check([anchored, same, other])
         self.assertEqual([p.status for p in result], ["ANCHORED", "ANCHORED", "AMBIGUOUS"])
 
+    def test_a_settled_part_keeps_the_repository_of_its_anchor(self):
+        anchored = PartResult(RefPart("mt32emu.h", 5112, 5112, "5112"), "ANCHORED",
+                              None, None, None, [], repo="schelling/dosbox-pure")
+        same = PartResult(RefPart("mt32emu.h", 5129, 5129, "5129"), "MOVED",
+                          None, 5112, 5112, [5112])
+        result = profile_sync.reconcile_self_check([anchored, same])
+        self.assertEqual(result[1].status, "ANCHORED")
+        self.assertEqual(result[1].repo, "schelling/dosbox-pure")
+
     def test_a_compared_part_is_never_rewritten(self):
         anchored = PartResult(RefPart("a.c", 5, 5, "5"), "ANCHORED", None, None, None, [])
         shifted = PartResult(RefPart("a.c", 9, 9, "9"), "SHIFTED", None, 12, 12, [])
@@ -4165,6 +4174,24 @@ class TestReconcilePerFile(unittest.TestCase):
         self.assertEqual(result[1].status, "SHIFTED")
 
 
+class TestCollapsingMoves(unittest.TestCase):
+    """A recale never folds two parts of one ref onto the same line."""
+
+    def test_a_move_onto_a_sibling_part_goes_to_review(self):
+        sha = PartResult(RefPart("mt32emu.h", 5112, 5112, "upstream mt32emu.h:5112", "upstream"),
+                         "ANCHORED", None, None, None, [])
+        info = PartResult(RefPart("mt32emu.h", 5129, 5129, "source mt32emu.h:5129", "source"),
+                          "MOVED", None, 5112, 5112, [5112])
+        result = profile_sync.refuse_collapsing_moves([sha, info])
+        self.assertEqual([p.status for p in result], ["ANCHORED", "AMBIGUOUS"])
+
+    def test_a_move_to_a_free_line_is_kept(self):
+        first = PartResult(RefPart("a.c", 5, 5, "a.c:5"), "ANCHORED", None, None, None, [])
+        moved = PartResult(RefPart("a.c", 9, 9, "a.c:9"), "MOVED", None, 12, 12, [12])
+        result = profile_sync.refuse_collapsing_moves([first, moved])
+        self.assertEqual(result[1].status, "MOVED")
+
+
 class TestRealignFlagMatrix(unittest.TestCase):
     """--realign-prose applies a flag or refuses it, never swallows it."""