If a jsPanel seems to disappear (most probably it's moved offscreen) on dragstart check CSS height
values for the
<body> elements. The
element height might be less than window height or even less than content height.
Make sure that
<body> height takes up the whole window height and dragging should work as expected.
jsPanel is Open Source and free. And that's what it will remain. However, if you like my work and want to support it I'd be very grateful for a small donation.
Thanks a lot to JetBrains for granting an All Products Pack Open Source License to jsPanel.