Highlight warnings like unused suppression statements in IDE

[ianduvall]

Is it possible to highlight warnings like unused suppression statements in the IDE? I have the option include_warnings=true in my .flowconfig but that seems to only affect the CLI.

[bdrobinson]

I've also noticed VSCode doesn't display these warnings – it's strange because I could swear it used to.

[bdrobinson]

In fact I notice that when I open up a file with unnecessary // $FlowFixMe comments, they are briefly underlined yellow (ie, the correct behaviour) and then the yellow underlines disappear.

[maxsalven]

Seeing the same behavior as @bdrobinson.