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Re: [p2-dev] Changelogs and specific version updates

For me the back button is outright disabled. And the real use case is even more convoluted -- for bugfix updates showing the last version is fine, whereas if there are two updates from different release series, both better be displayed.
The update workflow implemented in p2 is definitely not tailored for that. Instead it is tailored to help the user stay up to date w/o fuss or questions. As such it will always propose the highest version available for install.
You may want to look at the AvailableIUsPage since it is able to show different versions and display an icon when an IU presented is an update of something installed. Now if you couple this with the fact that an update can change IU id (for example IU B v1.0 could be an update of IU A 2.0), then may be you can present the various updates all at the same time for different streams (the streams would have a different ID).