Fix indentation of if/else in 'csharp-ts-mode' (bug#70345)

* lisp/progmodes/csharp-mode.el (csharp-ts-mode--indent-rules):
Fix indentation rules for 'if' and 'else'.

* test/lisp/progmodes/csharp-ts-mode-tests.el:
* test/lisp/progmodes/csharp-ts-mode-resources/indent.erts: New
test files.

Copyright-paperwork-exempt: yes

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/csharp-mode.el b/lisp/progmodes/csharp-mode.el
index 607360f737a..62bbbfe02ff 100644
--- a/lisp/progmodes/csharp-mode.el
+++ b/lisp/progmodes/csharp-mode.el
@@ -689,7 +689,9 @@ compilation and evaluation time conflicts."
      ((parent-is "binary_expression") parent 0)
      ((parent-is "block") parent-bol csharp-ts-mode-indent-offset)
      ((parent-is "local_function_statement") parent-bol 0)
-     ((parent-is "if_statement") parent-bol 0)
+     ((match "block" "if_statement") parent-bol 0)
+     ((match "else" "if_statement") parent-bol 0)
+     ((parent-is "if_statement") parent-bol csharp-ts-mode-indent-offset)
      ((parent-is "for_statement") parent-bol 0)
      ((parent-is "for_each_statement") parent-bol 0)
      ((parent-is "while_statement") parent-bol 0)