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Installer adds IDs of the installed components into productid file and the contents of this file is used as a prefix of userdir's unique ID in update center URLs. If a new component is installed later via Plugin Manager, its ID is not added to productid file and thus does not appear in the unique ID parameter of URLs. This has to be revised and evaluated for 6.0.
IDs of the components used by the installer are listed here: http://wiki.netbeans.org/wiki/view/NB6InstallableComponents
Needs a special support in AU or PM code which would be not platform generic but only NetBeans specific.
productid file should be merged from all cluster (userdir incl.) because Plugin Manager installs IDE components (like Ruby, C/C++, ...) into userdir. Plugin Manager should try read productid file across all clusters and merged them together when connecting to UC.
This task was removed from set of requires for NB6.0 (issue 110566). Target is changed to future for now.
It is not defined requirement for NB6.0 or later. Changed the issue type to Feature for future tracking.
It's not in our plans for a long time. IMHO I should close as WONTFIX.