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Dragged cards are incorrectly positioned when using frozen swimlanes and a fixed height

Dear Syncfusion team,

we are currently using your Kanban control and have found an issue. You can easily reproduce it in one of your examples: 

Kanban · Swimlane · Essential JS 2 · Syncfusion

Simply enable the frozen swimlanes, scroll the Kanban down a few pixels (for example so the second swimlane is at the top of the kanban) and start dragging a card. You will notice, it is no longer positioned near the bottom right of the mouse pointer, but instead offset upwards by the amount scrolled down. When you scroll down further, the dragged card will no longer be visible, since it is rendered outside of the scrolling viewport of the kanban.

As a workaround, we will disable frozen swimlanes until this is fixed. It would however be nice to have this feature working correctly.

Thanks for your support.

Cheers,
Christoph