Somehow related to #1575

When writing the contents of a string in an argument position, the signature data of the function is always popping up which is a bit distracting, particularly when using the "Highlight templates in F#" extension (see screen capture below).

The fix for #1575 was done in FsAutocomplete but I think in the case the code generating the signature data is here. Is there an easy way to detect if we're within a string literal and deactivate the popup in that case? (I had here some hacky code using regex for that.)