runtime: set 'cpoptions' for line-continuation in various runtime files

closes: #17121

Signed-off-by: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/rasi.vim b/runtime/syntax/rasi.vim
index 40c3393..c4c4508 100644
--- a/runtime/syntax/rasi.vim
+++ b/runtime/syntax/rasi.vim
@@ -2,6 +2,7 @@
 " Language:	rasi (Rofi Advanced Style Information)
 " Maintainer:	Pierrick Guillaume  <pierguill@gmail.com>
 " Last Change:	2024 May 21
+" 2025 Apr 16 by Vim Project (set 'cpoptions' for line continuation, #17121)
 "
 " Syntax support for rasi config file
 
@@ -12,6 +13,8 @@
   finish
 endif
 let b:current_syntax = 'rasi'
+let s:cpo_save = &cpo
+set cpo&vim
 
 " String {{{
 syn region rasiString    start=+"+ skip=+\\"+ end=+"+ oneline contained
@@ -295,4 +298,7 @@
 hi def link rasiInvPropertyVal  rasiError
 " }}}
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
 " vim:ts=8