Fix bugs found in MAUI repo (#6361)

Author: buyaa-n

src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/InteropServices/PlatformCompatibilityAnalyzer.cs

@@ -564,10 +564,13 @@ static bool IsKnownValueGuarded(
                                     }
                                 }
 
-                                if (attribute.SupportedFirst != null &&
-                                    info.Version.IsGreaterThanOrEqualTo(attribute.SupportedFirst))
+                                var checkVersion = attribute.SupportedSecond ?? attribute.SupportedFirst;
+
+                                if (checkVersion != null &&
+                                    info.Version.IsGreaterThanOrEqualTo(checkVersion))
                                 {
                                     attribute.SupportedFirst = null;
+                                    attribute.SupportedSecond = null;
                                     RemoveUnsupportedWithLessVersion(info.Version, attribute);
                                     RemoveOtherSupportsOnDifferentPlatforms(attributes, info.PlatformName);
                                 }
@@ -820,8 +823,11 @@ static void ReportSupportedDiagnostic(IOperation operation, OperationBlockAnalys
                     csPlatformNames = string.Join(CommaSeparator, csPlatformNames, PlatformCompatibilityAllPlatforms);
                 }
 
-                var rule = supportedRule ? SwitchSupportedRule(callsite) : SwitchRule(callsite, true);
-                context.ReportDiagnostic(operation.CreateDiagnostic(rule, operationName, JoinNames(platformNames), csPlatformNames));
+                if (!platformNames.IsEmpty)
+                {
+                    var rule = supportedRule ? SwitchSupportedRule(callsite) : SwitchRule(callsite, true);
+                    context.ReportDiagnostic(operation.CreateDiagnostic(rule, operationName, JoinNames(platformNames), csPlatformNames));
+                }
 
                 if (!obsoletedPlatforms.IsEmpty)
                 {

src/NetAnalyzers/UnitTests/Microsoft.NetCore.Analyzers/InteropServices/PlatformCompatibilityAnalyzer.ObsoletedOSPlatformTests.cs

@@ -453,6 +453,37 @@ public void ObsoletedOnLinuxAndWindows10() { }
             await VerifyAnalyzerCSAsync(csSource, s_msBuildPlatforms);
         }
 
+        [Fact]
+        public async Task CalledApiHasSupportedAndObsoletedAttributes_CallsiteSupressesSupportedAttributeWarnsForObsoletedOnly()
+        {
+            var source = @"
+using System;
+using System.Runtime.Versioning;
+
+class Program
+{
+    [Mock.ObsoletedOSPlatform(""ios7.0"", ""Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead."")]
+    [Mock.ObsoletedOSPlatform(""maccatalyst7.0"", ""Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead."")]
+    [SupportedOSPlatform(""ios"")]
+    [SupportedOSPlatform(""maccatalyst"")]
+    public static void M3() { }
+    
+    [SupportedOSPlatform(""ios"")]
+    public static void M1()
+    {
+         {|CA1422:M3()|}; // This call site is reachable on: 'ios', 'maccatalyst'. 'Program.M3()' is obsoleted on: 'ios' 7.0 and later (Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead.), 'maccatalyst' 7.0 and later (Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead.).
+    }
+
+    [SupportedOSPlatform(""ios10.0"")]
+    public static void M2()
+    {
+         {|CA1422:M3()|}; // This call site is reachable on: 'ios' 10.0 and later, 'maccatalyst' 10.0 and later. 'Program.M3()' is obsoleted on: 'ios' 7.0 and later (Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead.), 'maccatalyst' 7.0 and later (Use 'NSString.GetBoundingRect (CGSize, NSStringDrawingOptions, UIStringAttributes, NSStringDrawingContext)' instead.).
+    }
+}" + MockObsoletedAttributeCS;
+
+            await VerifyAnalyzerCSAsync(source);
+        }
+
         private readonly string MockObsoletedAttributeCS = @"
 namespace Mock
 {

src/NetAnalyzers/UnitTests/Microsoft.NetCore.Analyzers/InteropServices/PlatformCompatibilityAnalyzerTests.GuardedCallsTests.cs

@@ -4968,6 +4968,39 @@ void M1()
             await VerifyAnalyzerCSAsync(source);
         }
 
+        [Fact, WorkItem(4372, "https://github.com/dotnet/roslyn-analyzers/issues/6158")]
+        public async Task ChildApiNarrowedParentSupport_GuardingVersionShouldBeComparedWithChildVersion()
+        {
+            var source = @"
+using System;
+using System.Runtime.Versioning;
+
+[SupportedOSPlatform(""ios"")]
+[SupportedOSPlatform(""tvos"")]
+[SupportedOSPlatform(""maccatalyst"")]
+class Program
+{
+    [SupportedOSPlatform(""tvos10.2"")]
+    [SupportedOSPlatform(""ios10.3"")]
+    [SupportedOSPlatform(""maccatalyst10.3"")]
+    public static int P1 => 1;
+}
+class Test
+{
+    [SupportedOSPlatform(""ios10.0"")]
+    public void M1()
+    {
+        var rate = (OperatingSystem.IsIOSVersionAtLeast(10, 3) || OperatingSystem.IsMacCatalystVersionAtLeast(10, 3) || OperatingSystem.IsTvOSVersionAtLeast(10, 3))
+				    ? Program.P1 : 0; // guarded
+
+        if (OperatingSystem.IsIOSVersionAtLeast(10, 3) || OperatingSystem.IsMacCatalystVersionAtLeast(10, 3) || OperatingSystem.IsTvOSVersionAtLeast(10))
+            rate = [|Program.P1|]; // version of TvOS is not guarded
+    }
+}";
+
+            await VerifyAnalyzerCSAsync(source);
+        }
+
         [Fact]
         public async Task ApiAndGuardAttributeBothHasVersions_AttributeVersionWins()
         {