interactive property
Whether the card stays visible when the cursor moves onto it.
Defaults to true. The card is anchored at the pointer, so it is drawn
right beside the cursor and a small movement enters it; and a card is the
kind of thing whose contents a user may want to reach.
NodeTooltipTheme.interactive defaults to the opposite, and should: a
label tooltip explains text you read and then leave. Do not "fix" the
inconsistency — the two describe different things.
Implementation
final bool interactive;