Improve indenting "case" in Python

* lisp/progmodes/python.el (python-info-dedenter-statement-p): Do not
consider the first "case" in the block as dedenter.
* test/lisp/progmodes/python-tests.el
(python-info-dedenter-opening-block-positions-7)
(python-info-dedenter-statement-p-6): New tests. (Bug#62092)

2 files changed, 46 insertions, 1 deletions

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 2fe88323c35..bbabce80b4d 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -5854,7 +5854,14 @@ statement."
   (save-excursion
     (python-nav-beginning-of-statement)
     (when (and (not (python-syntax-context-type))
-               (looking-at (python-rx dedenter)))
+               (looking-at (python-rx dedenter))
+               ;; Exclude the first "case" in the block.
+               (not (and (string= (match-string-no-properties 0)
+                                  "case")
+                         (save-excursion
+                           (back-to-indentation)
+                           (python-util-forward-comment -1)
+                           (equal (char-before) ?:)))))
       (point))))
 
 (defun python-info-line-ends-backslash-p (&optional line-number)
diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index ed4a08da6ab..50153e66da5 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -5940,6 +5940,26 @@ def func():
      (equal (list (python-tests-look-at "if (" -1 t))
             (python-info-dedenter-opening-block-positions)))))
 
+(ert-deftest python-info-dedenter-opening-block-positions-7 ()
+  "Test case blocks."
+  (python-tests-with-temp-buffer
+   "
+match a:
+    case 1:
+        match b:
+            case 2:
+                something()
+            case 3:
+"
+   (python-tests-look-at "case 1:")
+   (should-not (python-info-dedenter-opening-block-positions))
+   (python-tests-look-at "case 2:")
+   (should-not (python-info-dedenter-opening-block-positions))
+   (python-tests-look-at "case 3:")
+   (equal (list (python-tests-look-at "case 2:" -1)
+                (python-tests-look-at "case 1:" -1 t))
+            (python-info-dedenter-opening-block-positions))))
+
 (ert-deftest python-info-dedenter-opening-block-message-1 ()
   "Test dedenters inside strings are ignored."
   (python-tests-with-temp-buffer
@@ -6125,6 +6145,24 @@ elif b:
                  (point))
                (python-info-dedenter-statement-p)))))
 
+(ert-deftest python-info-dedenter-statement-p-6 ()
+  "Test case keyword."
+  (python-tests-with-temp-buffer
+      "
+match a:  # Comment
+    case 1:
+        match b:
+            case 2:
+                something()
+            case 3:
+"
+    (python-tests-look-at "case 1:")
+    (should-not (python-info-dedenter-statement-p))
+    (python-tests-look-at "case 2:")
+    (should-not (python-info-dedenter-statement-p))
+    (python-tests-look-at "case 3:")
+    (should (= (point) (python-info-dedenter-statement-p)))))
+
 (ert-deftest python-info-line-ends-backslash-p-1 ()
   (python-tests-with-temp-buffer
    "