Replace the RenderPlayer hook (used subclassing) with a mixin (fixes #79)

src/main/java/com/replaymod/extras/playeroverview/mixin/MixinRender.java

@@ -0,0 +1,40 @@
+package com.replaymod.extras.playeroverview.mixin;
+
+import com.replaymod.extras.ReplayModExtras;
+import com.replaymod.extras.playeroverview.PlayerOverview;
+import net.minecraft.client.renderer.culling.ICamera;
+import net.minecraft.client.renderer.entity.Render;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.EntityPlayer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+/**
+ * This mixin prevents players that are hidden in the PlayerOverview from being rendered.
+ *
+ * Cancelling the RenderPlayerEvent.Pre is insufficient because it affects neither the shadows nor the fire texture.
+ * See: https://github.com/MinecraftForge/MinecraftForge/issues/2987
+ *
+ * The previous solution was to overwrite the RenderPlayer instances which has been dropped in favor of this one
+ * because it is less compatible with other mods whereas this one should be fine as long as no other mod completely
+ * overwrites the shouldRender method.
+ * One example of the previous solution breaking is when used with VanillaEnhancements because it replaces the
+ * RenderManager with a new custom one which in turn will reset our registered RenderPlayer instances because
+ * it does so after we have already registered with the old RenderManager.
+ */
+@Mixin(value = Render.class, priority = 1200)
+public abstract class MixinRender {
+    @Inject(method = "shouldRender", at=@At("HEAD"), cancellable = true)
+    public void replayModExtras_isPlayerHidden(Entity entity, ICamera camera, double camX, double camY, double camZ, CallbackInfoReturnable<Boolean> ci) {
+        ReplayModExtras.instance.get(PlayerOverview.class).ifPresent(playerOverview -> {
+            if (entity instanceof EntityPlayer) {
+                EntityPlayer player = (EntityPlayer) entity;
+                if (playerOverview.isHidden(player.getUniqueID())) {
+                    ci.setReturnValue(false);
+                }
+            }
+        });
+    }
+}