Mark the slides of the file explorer

[J.M.S]

Hello
A small suggestion for a future update or version:
it would be interesting in the main window to be able to mark the slides of the file explorer as you go along with a small sign in order to see at first glance which ones are already used. Obviously, it would be necessary to be able to erase this sign in the event that, during the realization, one decides not to use this slide.

[davegee]

Used Images are marked with BOLD (coloured) TEXT.

This does not currently apply to Images added in Objects and Animation.