Not working on notebooks that have images in markdowns

[ayhokuyan]

I was working on a homework notebook, where the notebook had markdowns with images, notes, etc. Although the semantic completer was enabled, I was not able to see any tab opening for completion while writing with/without pressing tab. Then I have copied the notebook and deleted all markdowns and the completion came back. I wish you could solve the problem since I prepare and also work on many notebooks with graphical content.