Annoying behaviour with quotes in Angular2HTML Fragment editor. Follow

When I go to edit HTML in my TypeScript (Angular 2 app) I usually bring up the intentions menu to put the HTML in its own editor and I'm experiencing some behaviour that only happens in this editor window, but not when I edit the template string directly..

If I type: <button class="

the editor inserts the second " as I expect.  I fill in my classes and then type a ".  If in the intentions editor I now have 2 closing quotes.  If I edit the html in the template string directly, it does not add a second quote as expected.  

I have the same issue in Intellij.  And it used to work properly.  Broke in the last few months I think.

Is this just a change to a configuration setting?

Thanks.