fix: executed_branch_arcs should limit itself to parsed possible arcs

Author: nedbat

coverage/results.py

@@ -211,6 +211,8 @@ def missing_branch_arcs(self) -> dict[TLineNo, list[TLineNo]]:
     def executed_branch_arcs(self) -> dict[TLineNo, list[TLineNo]]:
         """Return arcs that were executed from branch lines.
 
+        Only include ones that we considered possible.
+
         Returns {l1:[l2a,l2b,...], ...}
 
         """
@@ -219,6 +221,8 @@ def executed_branch_arcs(self) -> dict[TLineNo, list[TLineNo]]:
         for l1, l2 in self.arcs_executed:
             if l1 == l2:
                 continue
+            if (l1, l2) not in self.arc_possibilities_set:
+                continue
             if l1 in branch_lines:
                 eba[l1].append(l2)
         return eba