Would happen during panel's refresh drawing, if drawing code had to adjust final panel position compared to the initial one computed based on the mouse coordinates, and user had dragged the floating panel around. Issue fixed by adjusting stored mouse coordinates once final panel position is known, such that they would directly generate those coordinates. that way, the basic offset applied to those stored mouse coordinates during panel dragging is valid, and recreating panel based on those won't make it jump in screen. Note that panel will still jump in case user dragged it partially out of view - we could prevent that, but imho it's better to keep that behavior, since redraw can generate a popup of different size, which could end up with a totally out-of-view one... Hopefully this fix does not break anything else!