Enforce code style in build and convert errors to suggestions (#1676)

Instead of using `silence` we now use `suggestion` which enables
Roslynator and other tools to continue to show the warning, but not
block the build. This allows us to set `EnforceCodeStyleInBuild` now,
without having to fix everything, which helps prevent future mistakes.

Note that many of these should be fixed ASAP, and that we previously
thought we'd enabled all the maintainability warnings, but since they
are not turned on by default, the category does nothing.

Co-authored-by: Andy Schwartzmeyer <andrew@schwartzmeyer.com>

.editorconfig

@@ -32,16 +32,56 @@ dotnet_diagnostic.CA1823.severity = error
 dotnet_diagnostic.CA2007.severity = error
 # CA2016: Forward the CancellationToken parameter to methods that take one
 dotnet_diagnostic.CA2016.severity = error
-# All maintainability issues (dead code etc.)
+
+# TODO: Enable all maintainability issues (dead code etc.) and enforce
 # See: https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/maintainability-warnings
 dotnet_analyzer_diagnostic.category-Maintainability.severity = error
-# VSTHRD002: Synchronously waiting on tasks or awaiters may cause deadlocks
-# TODO: Fix all of these issues and explicitly ignore the intentional ones.
-dotnet_diagnostic.VSTHRD002.severity = silent
+
+# TODO: Fix all of these issues and explicitly ignore the intentional ones!
+
+# CA2016: Forward the CancellationToken parameter to methods that take one
+dotnet_diagnostic.CA2016.severity = suggestion
+# CS0618: A class member was marked with the Obsolete attribute
+dotnet_diagnostic.CS0618.severity = suggestion
+# CS0649: Uninitialized private or internal field declaration that is never assigned a value
+dotnet_diagnostic.CS0649.severity = suggestion
+# CS1998: This async method lacks 'await' operators and will run synchronously
+dotnet_diagnostic.CS1998.severity = suggestion
+# CS4014: Consider applying the await operator to the result of the call
+dotnet_diagnostic.CS4014.severity = suggestion
+
+# RCS1102: Make class static
+dotnet_diagnostic.RCS1102.severity = suggestion
+# RCS1139: Add summary element to documentation comment
+dotnet_diagnostic.RCS1139.severity = suggestion
+# RCS1194: Implement exception constructors
+dotnet_diagnostic.RCS1194.severity = suggestion
+# RCS1210: Return completed task instead of returning null
+dotnet_diagnostic.RCS1210.severity = suggestion
+# RCS1075: Avoid empty catch clause that catches System.Exception
+dotnet_diagnostic.RCS1075.severity = suggestion
+
+# VSTHRD002: Avoid problematic synchronous waits
+dotnet_diagnostic.VSTHRD002.severity = suggestion
+# VSTHRD003: Avoid awaiting foreign Tasks
+dotnet_diagnostic.VSTHRD003.severity = suggestion
+# VSTHRD105: Avoid method overloads that assume TaskScheduler.Current
+dotnet_diagnostic.VSTHRD105.severity = suggestion
+# VSTHRD100: Avoid async void methods
+dotnet_diagnostic.VSTHRD100.severity = suggestion
+# VSTHRD103: Call async methods when in an async method
+dotnet_diagnostic.VSTHRD103.severity = suggestion
+# VSTHRD110: Observe result of async calls
+dotnet_diagnostic.VSTHRD110.severity = suggestion
+# VSTHRD114: Avoid returning a null Task
+dotnet_diagnostic.VSTHRD114.severity = suggestion
 # VSTHRD200: Use "Async" suffix for awaitable methods
-dotnet_diagnostic.VSTHRD200.severity = silent
+dotnet_diagnostic.VSTHRD200.severity = suggestion
+
+# xUnit2013: Do not use equality check to check for collection size
+dotnet_diagnostic.xUnit2013.severity = suggestion
 # IDE0003: this and Me preferences
-dotnet_diagnostic.IDE0003.severity = silent
+dotnet_diagnostic.IDE0003.severity = suggestion
 
 [*.{json}]
 indent_size = 2

PowerShellEditorServices.Common.props

@@ -12,8 +12,8 @@
     <RepositoryUrl>https://github.com/PowerShell/PowerShellEditorServices</RepositoryUrl>
     <DebugType>portable</DebugType>
     <!-- See: https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/overview -->
-    <!-- TODO: Enable `EnforceCodeStyleInBuild` -->
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <!-- See: https://docs.microsoft.com/en-us/dotnet/core/compatibility/sdk/6.0/implicit-namespaces -->
     <DisableImplicitNamespaceImports>true</DisableImplicitNamespaceImports>
   </PropertyGroup>