Development notes

You will need Visual Studio 2022

Architecture

IVsSolutionEvents is implemented so we can hook into the OnAfterCloseSolution event to clear the errorListProvider.

DTE.Events are hooked into for OnBuildProjConfigBegin, OnBuildProjConfigDone, OnBuildBegin, OnBuildDone events.

Debugging (2019)

In Project Properties, Debug tab, set:

Select Start external program and set value to C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\devenv.exe (replace 'Enterprise' with 'Community' or 'Professional' as appropriate)
Set command line arguments to /RootSuffix Exp

Debugging (2022)

In Project Properties, Debug tab, set:

Select Start external program and set value to C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\devenv.exe (replace 'Enterprise' with 'Community' or 'Professional' as appropriate)
Set command line arguments to /RootSuffix Exp