If a component with a tooltip, get MousePressed event and MouseExited right after that
the ToolTipManager is not removed from the componene listeners list.
This rare situation can occur e.g. in automate testing when you do

robot.mouseMove() to the component
robot.mousePress(InputEvent.BUTTON1_MASK);
robot.mouseRelease(InputEvent.BUTTON1_MASK);
robot.mouseMove() to the another component

see suggested fix