GNOME remote desktop notification not persistent
When someone wants to connect to the builtin GNOME VNC server and must acknowledge the peer, a notification pops down at the top. However, this notification isn't persistent. When you hover over it, or move your cursor/press a key in general, the notification disappears. When opening the notification overview, it's still there, but when clicking on it there it disappears permanently. The only solution then is to ask the peer to initiate another connection.
Best would be to keep these notifications persistent, just like the "Low disk space" notification. Since this VNC connection prompt could potentially be a security problem. Knowing about it is important. Furthermore, the notification prompt is the only way to acknowledge the connecting peer. Leaving it persistent (until the user decides to accept or refuse the connection) assists a positive user experience.
Using GNOME 3.30 on Fedora 29.