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This bug appears on a Windows machine with a dual-monitor setup, with the left- hand monitor being the main desktop, i.e., the one where the Windows start bar is located, and with NetBeans being run spread across both monitors. When I hover the mouse over an item on the left-hand monitor to obtain the tooltip, the tooltip appears at the correct height, but at the left edge of the right-hand monitor, rather than right by the mouse.
*** This issue has been marked as a duplicate of 58076 ***