I'm working on https://redmine.postgresql.org/issues/5488 and as per the discussion, we'll remove the current tooltip way for showing the details. Instead, we'll add some popover/panel upon clicking a node which will stay until closed.
Below is the screenshot of partial implementation.
I like the idea of showing details in the pop up.
We also need to think about the details in the SVG file downloaded.
-- Ashesh
Please confirm if I can proceed with full implementation.