gq not working in IdeaVim

When text is selected, typing "gq" in vim should adjust hard wraps to match the maximum line width. I infer from the change log in the IdeaVim github repo that gq has been supported since at least 2013 (v0.3.2). Yet when I type gq, nothing happens. This is true in both Python files and in plain text files. If I choose "Fill paragraph" from the menu, however, it does what I would expect, meaning the functionality (and the line width) is correctly specified. The vertical yellow line in my window tells me that the text is definitely over the line wrap length when I try this. gq just doesn't do anything. Why might this happen?