Custom component not pulling through style on first add.

The thumbnail/image which it puts into the editor should be scaling to fit the container. I'm seeing it at original size on first-load, all subsequent block adds correctly fit whichever column they are dropped into. If you look at the export code, you can also see that the first time you drop a block in, it does not update the css. On subsequent blocks it's added

A couple of screenshots demonstrating the behaviour I'm seeing...

i guess this is related to this one and probably this one @artf

mmm not really

Changing modelThumbElement.setAttributes({"data-gallery":fileName}); to use addAttributes seems to fix it, but I'm not sure what is really happening (I'd expect the "wrong" behavior all the time, not only the first time). I'll investigate on this later