In F23, I just had to kill the process in subject, since it had gone mad.

All I had done before was to type "soft" in GNOME Shell, then enter the names of a few programs to check how they are displayed.

Upon checking Audacious, I noticed the uninstalled plugins. As I want one of the plugins to be installed always, I clicked the checkbox next to it, had to enter root password, and gnome-software started working on the installation. So far so good. However, just a few seconds later a tiny window opened up asking me for confirmation whether I wanted to remove the plugin package. That made no sense to me as I had just asked the program to install that plugin. I ran "rpm -qa --last|head" to verify that it's installed. Then I clicked "Cancel", refusing uninstallation of the plugin package. That made me curious. Perhaps the single click on the checkbox was received as two clicks? I went back to check, but the box was still marked.

Next I tried to reproduce the problem. I clicked the marked checkbox once more to start uninstalling the plugin package. It seemed to work. I verified via "rpm" again. Afterwards, I clicked the checkbox once more to install the plugin again. Then I closed gnome-software.

Just a short time later, when I ran "dnf -y update" in a terminal, another tiny window received focus, asking me again whether I wanted that plugin package to be removed. What a surprise. I no longer was using gnome-software at that time. I refused by clicking "Cancel". It said that something didn't work out. Then I noticed on the Shell's activity overview five of those tiny small windows, all asking me the same thing. No way to close them or cancel them. Either they didn't react, or they claimed something didn't work out. Hence I killed the process to make them go away.