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).

1 files changed, 5 insertions, 0 deletions

diff --git a/doc/lispref/keymaps.texi b/doc/lispref/keymaps.texi
index 6635f50960a..9daeb2c77f9 100644
--- 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