Created attachment 121527 [details]
The initial notification with the "Copy" action

SUMMARY
With the patch adding notification actions on desktop and Android, if we get a one-time code from a more-secure service via SMS (not that SMS codes are actually that secure...), Google's Messages app gives no "Reply" button, no text box to type in to (on Android's notification), and instead gives a "Copy <code>" button. If we click this, it copies to the clipboard on Android, which automatically syncs to the desktop clipboard, so we can paste it in to whatever service wanted the code on the desktop.

If we click the notification on the desktop, we would expect the same behavior. In fact, we do get the code into the clipboard, but in addition we get the reply-able notification reply box as a popup as well! Since there is no reply action on Android and since the button wasn't a reply button, this probably shouldn't happen.

STEPS TO REPRODUCE
1. Get one-time code via SMS
2. Click "Copy XXX" button on desktop notification
3. Get code into clipboard, but also get unwanted reply box

OBSERVED RESULT
One-time code + Reply box

EXPECTED RESULT
Just one-time code

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 29
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.58.0
Qt Version: 5.11.3

ADDITIONAL INFORMATION
CCing Nico since he originally wrote the code supporting notification actions. If you think there's an obvious answer, let me know! Otherwise, I have assigned this to myself since I am the dev in the best position to debug (though it is quite low on the priority list)