Molecule preview

[victorlarignon]

It happens very often that the yellow preview window of the molecule stays open even after we moved the pointer from the name of the molecule (cf. screenshot, you can't see it on the picture, but my pointer was somewhere on the right of the page, not on the name). Usually you have to hover the pointer again over the name to close it. If you move your pointer randomly over molecules (like in investigation) it will happen pretty fast if you want to try to reproduce it.