diff -r 61ab546b71c3 -r 73731fa8d1bd mercurial/filesetlang.py
--- a/mercurial/filesetlang.py	Sat Aug 04 17:08:33 2018 +0900
+++ b/mercurial/filesetlang.py	Sat Jul 21 17:13:34 2018 +0900
@@ -207,6 +207,8 @@
             return wb, _optimizeandops(op, tb, ta)
     if op == 'or':
         ws, ts = zip(*(_optimize(y) for y in x[1:]))
+        ts = tuple(it[1] for it in sorted(enumerate(ts),
+                                          key=lambda it: ws[it[0]]))
         return max(ws), (op,) + ts
     if op == 'list':
         ws, ts = zip(*(_optimize(y) for y in x[1:]))