"Change Set:		DragAndDropToArchiveViewer
Date:				31 October 2003
Author:			Adam Spitz
Edited Date:		21 April 2004
Edited By:			Ned Konz

Lets you drag-and-drop from the File List to the Archive Viewer.

Original code by Adam Spitz.

Ned Konz changed it to:

* accept dropping of directories too (possible from a FileList).

* remove any leading path components that are shared with the default
directory (also for 'add directory' button).

That is (assuming the default directory is '/home/ned/Squeak'):

- if you drop a file named: '/home/ned/Squeak/xyz/abc' the resultant
file will be called 'xyz/abc'.
- if you drop a directory named: '/home/ned/Squeak/xyz/abc' containing a
file named 'def' then the resultant file will be called 'xyz/abc/def'.
- if you drop a directory named: '/home/ned/xyz/abc' containing a file
named 'def' then the resultant file will be called 'xyz/abc/def'.
- if you drop a directory named: '/abc' containing a file named 'def'
then the resultant file will be called 'abc/def'.

"
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