Retrieve after resolve feature does not clean target directory first
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                 Key: IVYDE-105
                 URL: https://issues.apache.org/jira/browse/IVYDE-105
             Project: IvyDE
          Issue Type: Bug
    Affects Versions: 2.0.0.alpha1
         Environment: Eclipse 3.4
            Reporter: Sébastien Launay


I use the 'Retrieve after resolve' feature in order to populate the directory 
web/WEB-INF/lib
in my project using pattern 'web/WEB-INF/lib/[artifact]-[revision].[ext]'.

This directory is used by the servlet engine in order to load librairies, but 
the directory can
contain multiple artifact of the same module (mylib-1.0.jar and mylib-1.1.jar) 
or old dependencies
if you update your ivy.xml and then resolve again.

I know that removing files based on a pattern is dangerous and not trivial.
Removing files below the longest path without '[' may be a good alternative
(with an optional check box "Clean directory").

Another solution is to keep the previous retrieved artifacts and removing them 
if still
present just before the new retrieve.

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