allow the notification to be transient

[helonicer]

Is your feature request related to a problem? Please describe.
notification appear on my screensaver and display list taking up space from more important notifications. I feel that what is needed here is an indication, or a transient notification needed on the moment of copy but not after that.

Describe the solution you'd like
Make the notification "transient" which is displayed but not added to the list.
e.g. notify-send -h int:transient:1 "Hello" "World"

Describe alternatives you've considered

Additional context

[helonicer]

found the option. you call it show indicator.