VS2017 RC regression - 15 second UI block after pressing "." #1815
Description
In VisualFSharp.sln, I pressed "." at the following line in CompletionProvider.fs, soon after opening the solution.
let textLine = sourceText.Lines. .GetLineFromPosition(caretPosition)
The VS 2017 UI locked up for about 15 seconds. I didn't yet get a stack trace of the blocking code.