bug#44214: 28.0.50; css-mode: no completion in declaration with newline after

[Simen Heggestøyl]

This seems sufficient to me. Would you like to test it out?

diff --git a/lisp/textmodes/css-mode.el b/lisp/textmodes/css-mode.el
index 0d1eeed561..748a561bab 100644
--- a/lisp/textmodes/css-mode.el
+++ b/lisp/textmodes/css-mode.el
@@ -1357,7 +1357,9 @@ css--property-values
 (defun css--complete-property-value ()
   "Complete property value at point."
   (let ((property (and (looking-back "\\([[:alnum:]-]+\\):[^/][^;]*"
-                                     (line-beginning-position) t)
+                                     (or (ppss-innermost-start (syntax-ppss))
+                                         (point-min))
+                                     t)
                        (member (match-string-no-properties 1)
                                css-property-ids))))
     (when property