1 files changed, 12 insertions, 5 deletions

diff --git a/lisp/tooltip.el b/lisp/tooltip.el
index 1cf16fdb5d2..2aa487d0454 100644
--- a/lisp/tooltip.el
+++ b/lisp/tooltip.el
@@ -339,6 +339,8 @@ This is used by `tooltip-show-help' and
 (defvar tooltip-previous-message nil
   "The previous content of the echo area.")
 
+(defvar haiku-use-system-tooltips)
+
 (defun tooltip-show-help-non-mode (help)
   "Function installed as `show-help-function' when Tooltip mode is off.
 It is also called if Tooltip mode is on, for text-only displays."
@@ -374,8 +376,10 @@ It is also called if Tooltip mode is on, for text-only displays."
   "Function installed as `show-help-function'.
 MSG is either a help string to display, or nil to cancel the display."
   (if (and (display-graphic-p)
-           (or (not (eq window-system 'haiku)) ;; On Haiku, there isn't a reliable way to show tooltips
-                                               ;; above menus.
+           ;; On Haiku, system tooltips can't be displayed above
+           ;; menus.
+           (or (not (and (eq window-system 'haiku)
+                         haiku-use-system-tooltips))
                (not (menu-or-popup-active-p))))
       (let ((previous-help tooltip-help-message))
         (setq tooltip-help-message msg)
@@ -383,9 +387,12 @@ MSG is either a help string to display, or nil to cancel the display."
                ;; Cancel display.  This also cancels a delayed tip, if
                ;; there is one.
                (tooltip-hide))
-              ((equal-including-properties previous-help msg)
-               ;; Same help as before (but possibly the mouse has moved).
-               ;; Keep what we have.
+              ((equal previous-help msg)
+               ;; Same help as before (but possibly the mouse has
+               ;; moved or the text properties have changed).  Keep
+               ;; what we have.  If only text properties have changed,
+               ;; the tooltip won't be updated, but that shouldn't
+               ;; occur.
                )
               (t
                ;; A different help.  Remove a previous tooltip, and