fix MC-211561 (#435)

* fix MC-211561

* use an instanceof check for better mod compatibility

Author: MicrocontrollersDev

PATCHED.md

@@ -24,6 +24,7 @@
 | Basic    | [MC-176559](https://bugs.mojang.com/browse/MC-176559) | Breaking process resets when a pickaxe enchanted with Mending mends by XP / Mending slows down breaking blocks again                |
 | Basic    | [MC-183776](https://bugs.mojang.com/browse/MC-183776) | After switching gamemodes using F3+F4, you need to press F3 twice to toggle the debug screen                                        |
 | Basic    | [MC-197260](https://bugs.mojang.com/browse/MC-197260) | Armor Stand renders itself and armor dark if its head is in a solid block                                                           |
+| Basic    | [MC-211561](https://bugs.mojang.com/browse/MC-211561) | Fishing line appears in opposite hand when switching slots                                                                          |
 | Basic    | [MC-215531](https://bugs.mojang.com/browse/MC-215531) | The carved pumpkin overlay isn't removed when switching into spectator mode                                                         |
 | Basic    | [MC-217716](https://bugs.mojang.com/browse/MC-217716) | The green nausea overlay isn't removed when switching into spectator mode                                                           |
 | Basic    | [MC-231097](https://bugs.mojang.com/browse/MC-231097) | Holding the "Use" button continues to slow down the player even after the used item has been dropped                                |

src/client/java/dev/isxander/debugify/client/mixins/basic/mc211561/FishingHookRendererMixin.java

@@ -0,0 +1,20 @@
+package dev.isxander.debugify.client.mixins.basic.mc211561;
+
+import com.llamalad7.mixinextras.injector.ModifyReturnValue;
+import dev.isxander.debugify.fixes.BugFix;
+import dev.isxander.debugify.fixes.FixCategory;
+import net.minecraft.client.renderer.entity.FishingHookRenderer;
+import net.minecraft.world.entity.HumanoidArm;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.FishingRodItem;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@BugFix(id = "MC-211561", category = FixCategory.BASIC, env = BugFix.Env.CLIENT, description = "Fishing line appears in opposite hand when switching slots")
+@Mixin(FishingHookRenderer.class)
+public class FishingHookRendererMixin {
+    @ModifyReturnValue(method = "getHoldingArm", at = @At("RETURN"))
+    private static HumanoidArm fixHoldingArm(HumanoidArm original, Player player) {
+        return player.getOffhandItem().getItem() instanceof FishingRodItem ? original : player.getMainArm();
+    }
+}

src/client/resources/debugify.client.mixins.json

@@ -20,6 +20,7 @@
     "basic.mc183776.KeyboardHandlerMixin",
     "basic.mc197260.ArmorStandRendererMixin",
     "basic.mc197260.LivingEntityRendererMixin",
+    "basic.mc211561.FishingHookRendererMixin",
     "basic.mc215531.GuiMixin",
     "basic.mc217716.GameRendererMixin",
     "basic.mc22882.AbstractContainerScreenMixin",