Tweak regexp for object initializers in csharp-mode (bug#69571)

* lisp/progmodes/csharp-mode.el (csharp-guess-basic-syntax): Add
handling to not consider ended statements as object init openers.
* test/lisp/progmodes/csharp-mode-resources/indent.erts: New test
resources.
* test/lisp/progmodes/csharp-mode-tests.el: Add test for this particular
issue.

2 files changed, 49 insertions, 0 deletions

diff --git a/test/lisp/progmodes/csharp-mode-resources/indent.erts b/test/lisp/progmodes/csharp-mode-resources/indent.erts
new file mode 100644
index 00000000000..a676ecc9728
--- /dev/null
+++ b/test/lisp/progmodes/csharp-mode-resources/indent.erts
@@ -0,0 +1,19 @@
+Code:
+  (lambda ()
+    (csharp-mode)
+    (indent-region (point-min) (point-max)))
+
+Point-Char: |
+
+Name: Don't consider closed statements as object initializers. (bug#69571)
+
+=-=
+public class Foo {
+    void Bar () {
+        var x = new X();            // [1]
+        for (;;) {
+            x();
+        }  // [2]
+    }
+}
+=-=-=
diff --git a/test/lisp/progmodes/csharp-mode-tests.el b/test/lisp/progmodes/csharp-mode-tests.el
new file mode 100644
index 00000000000..f50fabf5836
--- /dev/null
+++ b/test/lisp/progmodes/csharp-mode-tests.el
@@ -0,0 +1,30 @@
+;;; csharp-mode-tests.el --- Tests for CC Mode C# mode  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2024 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'ert-x)
+(require 'csharp-mode)
+
+(ert-deftest csharp-mode-test-indentation ()
+  (ert-test-erts-file (ert-resource-file "indent.erts")))
+
+(provide 'csharp-mode-tests)
+;;; csharp-mode-tests.el ends here