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    I think this alludes to a UX bug in many, many tooltip implementations: tooltips on almost every platform (besides Win32 and macOS) often linger way too long because they don’t handle the case of the mouse leaving the parent window entirely, which stops the flow of messages that the tooltip uses. The result is the tooltip just sits there, sometimes obscuring the thing I wanted to reference from another window. And I’m punished for hovering the mouse above the control of interest however briefly because the parent window interprets that as me holding the mouse over the control indefinitely.

    “But, X platform has no way of knowing that the cursor is not over the window!”

    Then figure out a fallback, even if it means tooltips are displayed only for a maximum of 5 seconds.