The Tooltip widget is not wrapping long text nicely. If it has do display a multiline text it convers the whole viewport width and uses a vertical padding that is too small.

This is the rendering of a long text:

This is what I would expect instead:

You can play around with an example in the following dartpad (just make sure to make the output window narrow enough):
https://dartpad.dev/?id=c7c2d0dc0dba9f4d1915a00f67029d17&null_safety=true