Hi, these suggestions to improve the tool-bar consistency and also save
horizontal space got lost in the "Changes for emacs 28" discussion, so
I'm changing the subject. This only affects the gtk version, AFAIK windows
only shows the icons.

There were two proposals:
1 - remove :vertonly from all tool-bar items and change the default
value of tool-bar-style to image
2 - simply add :vertonly to save and undo

IMO option 1 is better, since option 2 makes the value text-image-horiz
useless.