Avoid "missing toolset" error in design-time builds #42360
Merged
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Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2172605
Part of #41791.
Summary
A new error trying to detect builds run with a split SDK/compiler inadvertently triggered when projects are opened in some cases, blocking NuGet restore and build in VS scenarios.
Customer Impact
Opening a .NET SDK project in Visual Studio can fail to restore packages and load the project with
NETSDK1216
.Regression?
Yes, introduced in 2a0c0f0.
Testing
Manual execution of scenario.
Risk
Low--avoids executing a new target that provides error information about a failed-to-restore state in cases where it shouldn't run. The target never existed before so it definitely didn't run in design-time builds then.