Right now, we use the cursor position to determine the target position for dropped items. However, it seems that during dragging of files, we do not always receive mouse events, thus cannot update the cursor position. To avoid this, this PR refactors the functionality to use the location of the drop event, instead of the last known cursor position.
Fixes#5237.
https://user-images.githubusercontent.com/1428930/224735951-9cd6ff62-a749-4ff3-8437-c0bee3c0dd05.mp4
