attempt to fix keyboard focus issues (failed)

Author: isXander

splitscreen/src/main/java/dev/isxander/splitscreen/client/LocalSplitscreenPawn.java

@@ -22,7 +22,7 @@ public class LocalSplitscreenPawn implements SplitscreenPawn {
     private final int index;
     private final InputMethod associatedInputMethod;
 
-    protected byte[] nonce;
+    protected byte @Nullable [] nonce;
 
     public LocalSplitscreenPawn(Minecraft minecraft, int index, InputMethod associatedInputMethod) {
         this.minecraft = minecraft;
@@ -90,7 +90,7 @@ public boolean isRemote() {
         return false;
     }
 
-    public byte[] getLastLoginNonce() {
+    public byte @Nullable [] getLastLoginNonce() {
         return nonce;
     }
 

splitscreen/src/main/java/dev/isxander/splitscreen/client/mixins/engine/reparent/InputConstantsMixin.java

@@ -4,6 +4,8 @@
 import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
 import com.mojang.blaze3d.platform.InputConstants;
 import dev.isxander.splitscreen.client.SplitscreenBootstrapper;
+import dev.isxander.splitscreen.client.engine.impl.reparenting.wm.NativeWindowHandle;
+import dev.isxander.splitscreen.client.engine.impl.reparenting.wm.WindowManager;
 import org.spongepowered.asm.mixin.Mixin;
 
 @Mixin(InputConstants.class)
@@ -17,6 +19,11 @@ private static void shouldAllowMouseGrab(long window, int cursorValue, double xP
         if (SplitscreenBootstrapper.getController()
                 .map(c -> c.getLocalPawn().getAssociatedInputMethod().isKeyboardAndMouse())
                 .orElse(false) || !SplitscreenBootstrapper.isSplitscreen()) {
+            WindowManager windowManager = WindowManager.get();
+            NativeWindowHandle nativeWindowHandle = windowManager.getNativeWindowHandle(window);
+            windowManager.setWindowFocused(nativeWindowHandle);
+            windowManager.setWindowForeground(nativeWindowHandle);
+
             original.call(window, cursorValue, xPos, yPos);
         }
     }