Impossible to move gadgets in the previous columns when a new column is added

To reproduce:

• create a dashboard with a column
• edit it in inline mode
• click add column button
• move the gadget from the first column to the second column
• try to move the gadget back to the first column -> it will not work, the message "You can drop gadgets here" will appear, but the column will not react when the gadget is hovered on top of it and if dropped, it will not be added to the first column, it will return back to the second column.

If save and continue is hit and page is refreshed, the gadget can be easily moved to the first column.