Suggestion: show tooltip when mouse hovers over long layer name / source name / comments in timeline

It's a minor thing, but often I have longer filenames and have been using comments to keep track of some things as well. However, if the text is too long, the source / file name gets an ellipsis at some point in the middle of the text, and comments are simply truncated (and sometimes it is not even obvious that this is happening). Making the columns wider helps, but then takes up valuable screen real estate. 

Would be great to show a tooltip with the full text when the mouse hovers over these. It honestly is a feature that seems standard in many UIs, and I was expecting one to appear initially when I first started messing with After Effects.

(I had initially posted this to the beta forum but this seems like a better place for it!)