Tool bar documentation clarification: Mention forcing updates

* doc/lispref/keymaps.texi (Tool Bar): Document that flipping the
status of a tool bar item doesn't necessarily update the visuals
(bug#42957).

diff --git a/doc/lispref/keymaps.texi b/doc/lispref/keymaps.texi
index 6635f50960a5aa79f04d7443972e604172891a8f..9daeb2c77f9ea4b6b7bcc8458d9a8bae459e02ba 100644 (file)
--- a/doc/lispref/keymaps.texi
+++ b/doc/lispref/keymaps.texi
@@ -2812,6 +2812,11 @@ the shift modifier:
 @xref{Function Keys}, for more information about how to add modifiers to
 function keys.
 
+If you have functions that change whether a tool bar item is enabled
+or not, this status is not necessarily updated visually immediately.
+To force recalculation of the tool bar, call
+@code{force-mode-line-update} (@pxref{Mode Line Format}).
+
 @node Modifying Menus
 @subsection Modifying Menus
 @cindex menu modification