Don't misindent 'else:' after 'if re.match:' in Python

* lisp/progmodes/python.el
(python-info-dedenter-opening-block-positions): Check that the
supposed block start is not a method call (bug#62031).

* test/lisp/progmodes/python-tests.el (python-indent-after-re-match):
New test.

Co-authored-by: Lele Gaifax <lele@metapensiero.it>

lisp/progmodes/python.el

@@ -5792,7 +5792,9 @@ likely an invalid python file."
           (catch 'exit
             (while (python-nav--syntactically
                     (lambda ()
-                      (re-search-backward (python-rx block-start) nil t))
+                      (cl-loop for pt = (re-search-backward (python-rx block-start) nil t)
+                               until (memq (char-before) '(nil ?\s ?\t ?\n))
+                               finally return pt))
                     #'<)
               (let ((indentation (current-indentation)))
                 (when (and (not (memq indentation collected-indentations))

test/lisp/progmodes/python-tests.el

@@ -1982,6 +1982,18 @@ match foo:
    (should (eq (car (python-indent-context)) :after-block-start))
    (should (= (python-indent-calculate-indentation) 8))))
 
+(ert-deftest python-indent-after-re-match ()
+  "Test BUG 62031 regression."
+  (python-tests-with-temp-buffer
+   "
+def test_re(string):
+    if re.match('^[a-c]+$', string):
+        print('yes')
+    else:
+    "
+   (python-tests-look-at "else:")
+   (should (= (python-indent-calculate-indentation) 4))))
+
 
 ;;; Filling