fix warnings

Core/AudioManager.cs

@@ -21,7 +21,7 @@ public class AudioManager
     private AudioManager()
     {
         var values = Environment.GetEnvironmentVariable("PATH");
-        foreach (var path in values.Split(Path.PathSeparator))
+        foreach (var path in values!.Split(Path.PathSeparator))
         {
             if (!Directory.Exists(path))
                 continue;

Core/Extensions.cs

@@ -2,6 +2,7 @@ namespace WlxOverlay.Core;
 
 public static class Extensions
 {
+#pragma warning disable CS1998
     public static async IAsyncEnumerable<T> AsAsync<T>(this IEnumerable<T> e)
     {
         foreach(var item in e)

Desktop/DBus/DBusConnection.cs

@@ -30,9 +30,9 @@ public void SetResult(T result)
 
         public ValueTaskSourceStatus GetStatus(short token) => _core.GetStatus(token);
 
-        public void OnCompleted(Action<object> continuation, object state, short token, ValueTaskSourceOnCompletedFlags flags)
+        public void OnCompleted(Action<object> continuation, object? state, short token, ValueTaskSourceOnCompletedFlags flags)
         {
-            _core.OnCompleted(continuation, state, token, flags);
+            _core.OnCompleted(continuation!, state, token, flags);
             _continuationSet = true;
         }
 
@@ -403,7 +403,7 @@ private void EmitOnSynchronizationContextHelper(Observer observer, Synchronizati
         // note: Send blocks the current thread until the SynchronizationContext ran the delegate.
         synchronizationContext.Send(static o =>
         {
-            DBusConnection conn = (DBusConnection)o;
+            DBusConnection conn = (DBusConnection)o!;
             conn._currentObserver!.Emit(conn._currentMessage!);
         }, this);
 

Desktop/DBus/UnixFdCollection.cs

@@ -47,7 +47,7 @@ public IntPtr DangerousGetHandle(int index)
                 return null;
             }
             _rawHandles[index] = (rawHandle, false);
-            return (T)Activator.CreateInstance(typeof(T), new object[] { rawHandle, true });
+            return (T)Activator.CreateInstance(typeof(T), new object[] { rawHandle, true })!;
         }
         else
         {

Desktop/Desktop.DBus.cs

@@ -4528,7 +4528,7 @@ protected static uint ReadMessage_v_u(Message message, DesktopObject _)
         protected static SafeHandle ReadMessage_h(Message message, DesktopObject _)
         {
             var reader = message.GetBodyReader();
-            return reader.ReadHandle<SafeHandle>();
+            return reader.ReadHandle<SafeHandle>()!;
         }
         protected static bool ReadMessage_v_b(Message message, DesktopObject _)
         {

Desktop/Wayland/WaylandOutput.cs

@@ -9,7 +9,7 @@ public class WaylandOutput : BaseOutput, IDisposable
 
     public uint IdName;
 
-    public WaylandOutput(uint idName, WlOutput handle)
+    public WaylandOutput(uint idName, WlOutput? handle)
     {
         IdName = idName;
         Handle = handle;

Numerics/Vector2Int.cs

@@ -39,8 +39,13 @@ public static explicit operator Vector2(Vector2Int vi)
 
     public override string ToString() => $"{X}x{Y}";
 
-    public override bool Equals(object obj)
+    public override bool Equals(object? obj)
     {
         throw new NotImplementedException();
     }
+
+    public override int GetHashCode()
+    {
+        return HashCode.Combine(X, Y);
+    }
 }