Project view is cropping filename. Not showing entire filename

Answered

I upgraded Intellij Idea to 2016.1.2, and now suddenly the project view has decided to crop the last part of the filenames that are long. 

I can't even use the horizontal bar to drag it into view. I must use the tooltip to view the name.

 

How can I make Intellij display the entire filename/classname?

 

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