runtime(doc): update doc for clipboard provider

closes: #20217

Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index a73055b09881e416470b7c8f4de3d6b41e558ffb..71585da898cf878351de1922674d6c418bf87acc 100644 (file)
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*     For Vim version 9.2.  Last change: 2026 Feb 14
+*eval.txt*     For Vim version 9.2.  Last change: 2026 May 15
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -5367,6 +5367,9 @@ order:
           is an empty string, then the type is automatically chosen.
        2. A |list| of strings to return to Vim, each representing a line.
 
+If an invalid value is returned, then this is not an error.  Instead the
+register will be left unchanged (not cleared).
+
                                                *clipboard-providers-copy*
 The "copy" callback returns nothing and takes the following arguments in the
 following order: