emacs-30 c154047c46a: Fix c-ts-mode--anchor-prev-sibling (bug#73661)

[Yuan Fu]

branch: emacs-30
commit c154047c46ae833a114e84d72e62269d12c3249d
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Fix c-ts-mode--anchor-prev-sibling (bug#73661)
    
    * lisp/progmodes/c-ts-mode.el:
    (c-ts-mode--anchor-prev-sibling):  Fix parentheses and use a
    slightly more efficient function.
    * test/lisp/progmodes/c-ts-mode-resources/indent.erts: Replace
    the tab in the test code with spaces.
---
 lisp/progmodes/c-ts-mode.el                         | 17 +++++++++--------
 test/lisp/progmodes/c-ts-mode-resources/indent.erts |  2 +-
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 576d715510d..12003ff4727 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -321,16 +321,17 @@ characters of the current line."
           ((or "#elif" "#else")
            (setq prev-sibling (treesit-node-prev-sibling
                                (treesit-node-parent prev-sibling) t)))
-          ;; If the start of the previous sibling isn't at the
-          ;; beginning of a line, something's probably not quite
-          ;; right, go a step further. (E.g., comment after a
-          ;; statement.)  If the previous sibling is the first named
-          ;; node then anchor to that, e.g. when returning an aggregate
-          ;; and starting the items on the same line as {.
+          ;; If the start of the previous sibling isn't at the beginning
+          ;; of a line, something's probably not quite right, go a step
+          ;; further. (E.g., comment after a statement.)  If the
+          ;; previous sibling is the first named node, then anchor to
+          ;; that, e.g. when returning an aggregate and starting the
+          ;; items on the same line as {.
           (_ (goto-char (treesit-node-start prev-sibling))
              (if (or (looking-back (rx bol (* whitespace))
-                                   (line-beginning-position)))
-                     (null (treesit-node-prev-sibling prev-sibling t))
+                                   (line-beginning-position))
+                     (treesit-node-eq (treesit-node-child parent 0 t)
+                                      prev-sibling))
                  (setq continue nil)
                (setq prev-sibling
                      (treesit-node-prev-sibling prev-sibling)))))))
diff --git a/test/lisp/progmodes/c-ts-mode-resources/indent.erts 
b/test/lisp/progmodes/c-ts-mode-resources/indent.erts
index a13a74cf8b3..f97ceac61f5 100644
--- a/test/lisp/progmodes/c-ts-mode-resources/indent.erts
+++ b/test/lisp/progmodes/c-ts-mode-resources/indent.erts
@@ -214,7 +214,7 @@ Name: Return Compund Literal
 struct pair { int fst, snd; };
 struct pair
 make_pair(int long_identifier_a[], int long_identifier_b[],
-         int offset_a, int offset_b)
+          int offset_a, int offset_b)
 {
   int base_offset = 10;
   return (struct pair) { long_identifier_a[base_offset + offset_b],