Flatpak add-on cannot be uninstalled if the base application was uninstalled first
Description of problem:
When a Flatpak application is uninstalled, its add-ons stay installed and cannot be uninstalled if the base app is not installed. Clicking their checkbox does nothing (and there is nothing in the GS verbose log).
Version-Release number of selected component (if applicable):
gnome-software-3.32.0-3.fc30.x86_64
How reproducible:
Every time.
Steps to Reproduce:
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Use latest Fedora (Silverblue) Rawhide system.
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Add Flathub repo using GNOME Software: https://flatpak.org/setup/Fedora/
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Find "Sublime Text" and install it.
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Install the "Sublime Text Developer Utilities" add-on.
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Uninstall Sublime Text.
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Try to uninstall the add-on.