Comment 1 for bug 510707

In larger projects it's hard to remember which project files have been used already.

OpenShot should provide a solution so people can see which files have been used / have not been used.

I know of two solutions:
 1. Add a project file filter "show unused files only". Enabling it would hide all video and audio files that are not part of the timeline yet
 2. Show a small icon in the project file list for each file that indicates that the file is part of the timeline already (e.g. small green checkmark)