If "Exact Docset" is enabled in settings it doesn't work

[aidan-gibson]

Worked with json for some reason but not R.
I tried messing with settings.json but no dice.

To reproduce:

• Enable Dash: Exact Docset
• Open a file ending in R, put the cursor within an R function, say, deparse
• "Search in Dash for current selection" command
  Nothing will happen.

If you uncheck "Exact Docset" it works.