How to remove an unwanted shadow

[zeuspaul]

In addition to rich2005's suggestion  "Another way is create a selection next to the shadow copy / paste and move the pasted area over the shadow" you can also first create the selection over the shadow, then move the selection (in move mode- ctrl alt drag) to an adjacent area then copy / undo / paste (ctrl C ctrl Z ctrl V) to paste the adjacent area over the shadow.