show tooltip when mouse move over toolbar buttons

Is there some option which can be used to toggle the tooltip display when the mouse moves over the toolbar buttons ?

Or any callbacks ? For example, `setToolbarButtonHoverCallback` with the target button detail as the param

Because not every user are very familiar with what the button means, so I want to show the tooltip when user moves the mouse over the button.

Start by locating the toolbar button implementation and any existing mouse-hover handling in the JavaScript port. Determine whether the requested behavior should be a tooltip option, a hover callback, or both; done means toolbar buttons expose a documented way to show their meaning on mouse movement.

Written by the indexing model from the issue text.