How to automatically update requested feature state during reinstall

[zdavidsen]

Our installer (let's call it I) contains components to integrate with multiple other products (e.g. A and B), organized into features that are automatically selected for installation if the relevant product is already installed.

The problem comes when the installers are run in the wrong order, e.g. A -> I -> B (instead of A -> B -> I). In this case, our features for working with B are not installed, and re-running the installer doesn't install those features. We'd like to be able to re-evaluate feature states during re-install so that our product doesn't have to be fully uninstalled then reinstalled in order to have the correct components.

It seems like this should be possible, but I just haven't found the right setup to enable it. I've already implemented a clone of the FindRelatedProducts action so that product detection runs during reinstall, but it seems there are some more required steps that I haven't stumbled upon yet