emacs-31 c0a33a474d3: Fix c-ts-mode bsd-style indentation of union bodies (bug#81255)

branch: emacs-31
commit c0a33a474d3f536357b125996b16a9ace484199d
Author: समीर सिंह Sameer Singh <[email protected]>
Commit: Yuan Fu <[email protected]>

    Fix c-ts-mode bsd-style indentation of union bodies (bug#81255)
    
    * lisp/progmodes/c-ts-mode.el (c-ts-mode--simple-indent-rules): Add
    "union_specifier" to the parent-is regexp.
    
    * test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts: New test.
---
 lisp/progmodes/c-ts-mode.el                             | 1 +
 test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index d08615446a1..5f064716a89 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -501,6 +501,7 @@ MODE can be `c' or `cpp'.  STYLE can be `gnu', `k&r', `linux', `bsd'."
            ((parent-is ,(rx (or "function_definition"
                                 "struct_specifier"
                                 "enum_specifier"
+                                "union_specifier"
                                 "function_declarator"
                                 "template_declaration")))
             standalone-parent 0)
diff --git a/test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts b/test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts
index 2325b3b008d..66a8153c63f 100644
--- a/test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts
+++ b/test/lisp/progmodes/c-ts-mode-resources/indent-bsd.erts
@@ -125,3 +125,12 @@ if (true)
 else
         break;
 =-=-=
+
+Name: Union (bug#81255)
+
+=-=
+union u
+{
+        int i;
+};
+=-=-=