vim-patch:9.0.1734: :runtime completion fails for multiple args (#24767)

Problem: :runtime completion fails for multiple args
Solution: Make it work

closes: vim/vim#12616

be5cdd1d63

src/nvim/runtime.c

@@ -265,6 +265,15 @@ void set_context_in_runtime_cmd(expand_T *xp, const char *arg)
   char *p = skiptowhite(arg);
   runtime_expand_flags
     = *p != NUL ? get_runtime_cmd_flags((char **)&arg, (size_t)(p - arg)) : 0;
+  // Skip to the last argument.
+  while (*(p = skiptowhite_esc(arg)) != NUL) {
+    if (runtime_expand_flags == 0) {
+      // When there are multiple arguments and [where] is not specified,
+      // use an unrelated non-zero flag to avoid expanding [where].
+      runtime_expand_flags = DIP_ALL;
+    }
+    arg = skipwhite(p);
+  }
   xp->xp_context = EXPAND_RUNTIME;
   xp->xp_pattern = (char *)arg;
 }