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).
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