make older targets build from VS2026

Author: mfkl

src/Directory.Build.props

@@ -1,4 +1,11 @@
 <Project>
+  <!-- Redirect to VS2022 for legacy Xamarin TFMs (VS2026+ compatibility) -->
+  <PropertyGroup Condition="$([MSBuild]::IsOsPlatform('Windows')) And ($(TargetFramework.Contains('monoandroid')) Or $(TargetFramework.Contains('xamarin')))">
+    <MSBuildExtensionsPath>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild</MSBuildExtensionsPath>
+    <VsInstallRoot>C:\Program Files\Microsoft Visual Studio\2022\Community</VsInstallRoot>
+    <TargetFrameworkRootPath>C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\</TargetFrameworkRootPath>
+  </PropertyGroup>
+
   <PropertyGroup Condition="$(TargetFramework.Contains('ios'))">
     <DefineConstants>$(DefineConstants);IOS;APPLE</DefineConstants>
   </PropertyGroup>

src/LibVLCSharp.Android.AWindow/LibVLCSharp.Android.AWindow.csproj

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- Redirect to VS2022 for legacy Xamarin tooling (VS2026+ compatibility) -->
+  <PropertyGroup Condition="!Exists('$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.Bindings.targets')">
+    <MSBuildExtensionsPath>C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild</MSBuildExtensionsPath>
+    <TargetFrameworkRootPath>C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\</TargetFrameworkRootPath>
+  </PropertyGroup>
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>