Created attachment 469153 [details] [diff] [review] fix This is because panels are constrained to the area of the screen they are on, so jump to fit when crossing over. Instead, when moving a popup, don't constrain or flip a popup.
haven't tested this on windows but presumably the behavior's the same there. Thanks for filing!
this is a usability improvement. Should this block?
Comment on attachment 469153 [details] [diff] [review] fix This patch skips the block where we constrain and flip the panel to fit on the screen when the panel is being moved. There might be specific cases where someone does want this behaviour, for instance, when popup.moveTo is called directly but I can add that in a followup bug.
Not going to hold the release for this change. Would definitely consider approval if the patch is safe and tested.