+ DEFVAR_BOOL ("tooltip-reuse-hidden-frame", tooltip_reuse_hidden_frame,
+ doc: /* Non-nil means reuse hidden tooltip frames.
+When this is nil, delete a tooltip frame when hiding the associated
+tooltip. When this is non-nil, make the tooltip frame invisible only,
+so it can be reused when the next tooltip is shown.
+
+Setting this to non-nil may drastically reduce the consing overhead
+incurred by creating new tooltip frames. However, a value of non-nil
+means also that intermittent changes of faces or `default-frame-alist'
+are not applied when showing a tooltip in a reused frame.
+
+This variable is effective only with the X toolkit (and there only when
+Gtk+ tooltips are not used) and on Windows. */);
+ tooltip_reuse_hidden_frame = false;
+