Canceling app installation requires waiting for app installation to finish
Using gnome-software-46.0-1.fc40, I search for "Document Viewer" and click the Install button. Then I immediately click Cancel.
Expected behavior: app installation should be immediately canceled
Actual behavior: app installation slowly proceeds to 100%, then is canceled
The cancellation does work correctly in that the app is not installed when the operation has finished. But it surely shouldn't require this wait or continue showing progress updates.