This was used when you pressed the "Attach file/image" button but had an
image copied to your clipboard - allowing you to select from either
source. This is a weird thing to ask, the button should always prompt
you with a file dialog.
It's still possible to paste an image from your clipboard with CTRL+V,
but there isn't a way to do it via right-click yet.
Fixes#712
This was incorrectly labeled as "Format Text" during the rich text
refactor, but this is for attaching stuff to messages.
I also fixed the checked state not resetting when the menu was closed.
BUG: 516117
BUG: 516119
FIXED-IN: 26.04
