Fix the case in which we need a using rename in the bindings. This happends with nfloat.

Author: mandel-macaque

src/rgen/Microsoft.Macios.Generator/Extensions/SyntaxTreeExtensions.cs

@@ -16,6 +16,7 @@ public static IReadOnlySet<string> CollectUsingStatements (this SyntaxTree self)
 		var usingDirectives = self.GetRoot ()
 			.DescendantNodes ()
 			.OfType<UsingDirectiveSyntax> ()
+			.Where (d => d.Alias is null)
 			.Select (d => d.Name!.ToString ()).ToArray ();
 
 		// remove any possible duplicates by using a set

tests/rgen/Microsoft.Macios.Generator.Tests/Classes/Data/PropertyTests.cs

@@ -8,6 +8,7 @@
 using Foundation;
 using ObjCBindings;
 using ObjCRuntime;
+using nfloat = System.Runtime.InteropServices.NFloat;
 
 namespace TestNamespace;
 

tests/rgen/Microsoft.Macios.Generator.Tests/Classes/Data/iOSExpectedPropertyTests.cs

@@ -439,15 +439,15 @@ public virtual partial bool IsLenient
 	[SupportedOSPlatform ("tvos")]
 	[SupportedOSPlatform ("maccatalyst13.1")]
 	[BindingImpl (BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
-	public virtual partial global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat LineSpacing
+	public virtual partial global::System.Runtime.InteropServices.NFloat LineSpacing
 	{
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("ios")]
 		[SupportedOSPlatform ("tvos")]
 		[SupportedOSPlatform ("maccatalyst13.1")]
 		get
 		{
-			global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat ret;
+			global::System.Runtime.InteropServices.NFloat ret;
 			if (IsDirectBinding) {
 				ret = global::ObjCRuntime.Messaging.nfloat_objc_msgSend (this.Handle, global::ObjCRuntime.Selector.GetHandle ("lineSpacing"));
 			} else {

tests/rgen/Microsoft.Macios.Generator.Tests/Classes/Data/macOSExpectedPropertyTests.cs

@@ -439,15 +439,15 @@ public virtual partial bool IsLenient
 	[SupportedOSPlatform ("tvos")]
 	[SupportedOSPlatform ("maccatalyst13.1")]
 	[BindingImpl (BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
-	public virtual partial global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat LineSpacing
+	public virtual partial global::System.Runtime.InteropServices.NFloat LineSpacing
 	{
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("ios")]
 		[SupportedOSPlatform ("tvos")]
 		[SupportedOSPlatform ("maccatalyst13.1")]
 		get
 		{
-			global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat ret;
+			global::System.Runtime.InteropServices.NFloat ret;
 			if (IsDirectBinding) {
 				ret = global::ObjCRuntime.Messaging.nfloat_objc_msgSend (this.Handle, global::ObjCRuntime.Selector.GetHandle ("lineSpacing"));
 			} else {

tests/rgen/Microsoft.Macios.Generator.Tests/Classes/Data/tvOSExpectedPropertyTests.cs

@@ -439,15 +439,15 @@ public virtual partial bool IsLenient
 	[SupportedOSPlatform ("tvos")]
 	[SupportedOSPlatform ("maccatalyst13.1")]
 	[BindingImpl (BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
-	public virtual partial global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat LineSpacing
+	public virtual partial global::System.Runtime.InteropServices.NFloat LineSpacing
 	{
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("ios")]
 		[SupportedOSPlatform ("tvos")]
 		[SupportedOSPlatform ("maccatalyst13.1")]
 		get
 		{
-			global::CompareGeneratedCode.CompareGeneratedCode.netmodule..nfloat ret;
+			global::System.Runtime.InteropServices.NFloat ret;
 			if (IsDirectBinding) {
 				ret = global::ObjCRuntime.Messaging.nfloat_objc_msgSend (this.Handle, global::ObjCRuntime.Selector.GetHandle ("lineSpacing"));
 			} else {