Rich Text Box tooltip bug?

I noticed that if you hover your mouse above the 1-pixel-wide left border of these rich-text boxes in Waypoint, you get a generic little HTML tooltip that says “Rich Text Area. Press ALT-F9 for menu. Press ALT-F10 for toolbar. Press ALT-0 for help.” I thought this was very peculiar, and upon trying those keyboard shortcuts, they don’t seem to do anything. Go ahead and try it for yourself. Here’s a link to a screenshot: http://1drv.ms/1D7LwiC

What is this little gem?