[suggestion] Show a warning when you click a link during a lesson, so the lesson doesn't end
It's EXTREMELY annoying when I accidentally click on a link while I'm in the middle of a lesson and I have to start the lesson over again. This usually happens when I go to the "Discuss sentence" section. I've seen some other people here mention this problem as well, and I see no reason why it shouldn't be added as a feature, as a lot of sites have it.
I've been bitten by this before as well.
Some links seem to open in a new tab, some in the same one... losing my progress.
I haven't yet looked to see what the difference is but suspect it may be to do with auto-linkified links (where the user just typed the URL) versus Markdown links (where the user used brackets and parentheses to make a clickable link).