Issue #18375: Assume --randomize when --randseed is used for running the testsuite.

Lib/test/regrtest.py

@@ -346,6 +346,7 @@ def main(tests=None, testdir=None, verbose=0, quiet=False,
         elif o in ('-r', '--randomize'):
             randomize = True
         elif o == '--randseed':
+            randomize = True
             random_seed = int(a)
         elif o in ('-f', '--fromfile'):
             fromfile = a

Misc/NEWS

@@ -158,6 +158,9 @@ IDLE
 Tests
 -----
 
+- Issue #18375: Assume --randomize when --randseed is used for running the
+  testsuite.
+
 - Issue #11185: Fix test_wait4 under AIX.  Patch by Sébastien Sablé.
 
 - Issue #17691: test_univnewlines now works with unittest test discovery.