Bug#792841: icon-theme.cache files don't get removed on package removal or deconfiguration

[Mike Gabriel]

Package: mate-themes
Version: 1.9.2-1
Severity: serious

In the process of upgrading mate-themes to 1.10 in unstable, I  
discovered an issue with /usr/share/icons/<theme>/icon-theme.cache  
files.

These files should be removed in the package's prerm script, but a  
prerm script is not present in mate-themes.

The proposal for getting this fixed is:

   o fix mate-themes 1.9.2-1 in Debian jessie (to already even out the  
upgrade path
     once Debian stretch comes into play)
   o provide a fix-up in the preinst script of the first mate-themes  
1.10 package upload
     that checks if we upgrade from 1.9.3-1 or from a version before  
1.9.2-1+deb8u1 and
     and if so, remove those icon-theme.cache files during preinst.

Greets,
Mike
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