Use tooltip_text to set default accessible name on GtkToolButtons
Submitted by Michael Catanzaro
If no accessible name is set on a GtkButton, the tooltip text is used instead. But GtkToolButtons with a tooltip are completely inaccessible unless an accessible name is set manually. If we change this to match the behavior of GtkButton, many toolbars will become accessible for free.
- Might be evil? (Ben?)
- Maybe belongs in GtkToolItem instead?