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VS 2019 16.0.0 RC.3/Preview 4.3 freezes frequently when Intellisense active while editing F# #6341

@BentTranberg

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@BentTranberg

I updated to VS 2019 Preview 4.3, and also installed the corresponding RC.3. They both permanently froze (hung) typically only a minute or two into editing, so I could not really get much work done.

I turned off the status bar, because I suspected it could be related to issue #6335 that I opened a few days ago. It didn't help, which makes sense, because this behaves differently. There could be some behavioral pattern while I edit, but if so I haven't noticed what it is.

Just like in issue #6335, when the freeze occurs, there is a message in the status bar that reads "Locating the symbol under the caret...". This makes me think Intellisense is involved, so in the Error List pane I changed from "Build + Intellisense" to "Build Only". I have not had any freezes after that.

I do not know if this issue belongs here or in some other repo. I mostly work with F# and XAML - very little C# (minimal code behind) and no VB. In earlier previews (edit: and now also once in this latest) I've had freezes while working with XAML. I have not tried reproducing this issue while editing other code than F#.

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