Ignore drive casing when comparing on windows platforms

src/Compilers/Core/CodeAnalysisTest/Analyzers/AnalyzerConfigTests.cs

@@ -10,6 +10,7 @@
 using System.Linq;
 using Microsoft.CodeAnalysis.PooledObjects;
 using Roslyn.Test.Utilities;
+using Roslyn.Utilities;
 using Xunit;
 using static Microsoft.CodeAnalysis.AnalyzerConfig;
 using static Roslyn.Test.Utilities.TestHelpers;
@@ -63,30 +64,30 @@ public void ConfigWithEscapedValues()
         {
             var config = ParseConfigFile(@"is_global = true
 
-[c:/\{f\*i\?le1\}.cs]
+[C:/\{f\*i\?le1\}.cs]
 build_metadata.Compile.ToRetrieve = abc123
 
-[c:/f\,ile\#2.cs]
+[C:/f\,ile\#2.cs]
 build_metadata.Compile.ToRetrieve = def456
 
-[c:/f\;i\!le\[3\].cs]
+[C:/f\;i\!le\[3\].cs]
 build_metadata.Compile.ToRetrieve = ghi789
 ");
 
             var namedSections = config.NamedSections;
-            Assert.Equal("c:/\\{f\\*i\\?le1\\}.cs", namedSections[0].Name);
+            Assert.Equal("C:/\\{f\\*i\\?le1\\}.cs", namedSections[0].Name);
             AssertEx.Equal(
                 new[] { KeyValuePair.Create("build_metadata.compile.toretrieve", "abc123") },
                 namedSections[0].Properties
             );
 
-            Assert.Equal("c:/f\\,ile\\#2.cs", namedSections[1].Name);
+            Assert.Equal("C:/f\\,ile\\#2.cs", namedSections[1].Name);
             AssertEx.Equal(
                 new[] { KeyValuePair.Create("build_metadata.compile.toretrieve", "def456") },
                 namedSections[1].Properties
             );
 
-            Assert.Equal("c:/f\\;i\\!le\\[3\\].cs", namedSections[2].Name);
+            Assert.Equal("C:/f\\;i\\!le\\[3\\].cs", namedSections[2].Name);
             AssertEx.Equal(
                 new[] { KeyValuePair.Create("build_metadata.compile.toretrieve", "ghi789") },
                 namedSections[2].Properties
@@ -118,14 +119,15 @@ public void CanGetSectionsWithSpecialCharacters()
         [ConditionalFact(typeof(WindowsOnly))]
         public void CanGetSectionsWithDifferentDriveCasing()
         {
-            var config = ParseConfigFile(@"is_global = true
+            var config = Parse(@"is_global = true
+build_metadata.compile.toretrieve = global
 
-[c:\goo\file.cs]
+[c:/goo/file.cs]
 build_metadata.compile.toretrieve = abc123
 
-[C:\goo\other.cs]
+[C:/goo/other.cs]
 build_metadata.compile.toretrieve = def456
-");
+", pathToFile: @"C:/.editorconfig");
 
             var set = AnalyzerConfigSet.Create(ImmutableArray.Create(config));
 
@@ -140,6 +142,12 @@ public void CanGetSectionsWithDifferentDriveCasing()
 
             sectionOptions = set.GetOptionsForSourcePath(@"c:\goo\other.cs");
             Assert.Equal("def456", sectionOptions.AnalyzerOptions["build_metadata.compile.toretrieve"]);
+
+            sectionOptions = set.GetOptionsForSourcePath(@"c:\global.cs");
+            Assert.Equal("global", sectionOptions.AnalyzerOptions["build_metadata.compile.toretrieve"]);
+
+            sectionOptions = set.GetOptionsForSourcePath(@"C:\global.cs");
+            Assert.Equal("global", sectionOptions.AnalyzerOptions["build_metadata.compile.toretrieve"]);
         }
 
         [ConditionalFact(typeof(WindowsOnly))]
@@ -2266,6 +2274,8 @@ public void GlobalConfigOptionsAreEmptyWhenNoGlobalConfig()
         [InlineData("", true)] // only true because [] isn't a valid editorconfig section name either and thus never gets parsed
         public void GlobalConfigIssuesWarningWithInvalidSectionNames(string sectionName, bool isValid)
         {
+            sectionName = PathUtilities.NormalizeDriveLetter(sectionName);
+
             var configs = ArrayBuilder<AnalyzerConfig>.GetInstance();
             configs.Add(Parse($@"
 is_global = true

src/Compilers/Core/Portable/CommandLine/AnalyzerConfig.cs

@@ -256,6 +256,9 @@ public static AnalyzerConfig Parse(SourceText text, string? pathToFile)
             // Add the last section
             addNewSection();
 
+            // Normalize the path to file the same way we named sections are done
+            pathToFile = PathUtilities.NormalizeDriveLetter(pathToFile);
+
             return new AnalyzerConfig(globalSection!, namedSectionBuilder.ToImmutable(), pathToFile);
 
             void addNewSection()