We have been plagued for some time by changes to Gtk which have made
tooltips unusable in some builds.
I've implemented a new tooltip system that won't be affected by what Gtk
does with its tooltips in future. It works somewhat differently
(unfortunately): you need to move the mouse over the item for the
tooltip to pop up. The tooltip can be dismissed either by quitting it or
by clicking - it won't reappear for the same item unless you first move
off the item and return. So in practice a shake of the mouse will remove
the tooltip, (in and out of the tip).
But, best of all the speed with which they pop-up is once again
I've made this available for all builds, as that is the future proof way
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