Allow sneaking inside blocks/vehicles in <= 1.13.2

Closes #506

src/main/java/de/florianmichael/viafabricplus/injection/mixin/fixes/minecraft/entity/MixinClientPlayerEntity.java

@@ -35,7 +35,6 @@
 import net.minecraft.client.network.ClientPlayerEntity;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.entity.Entity;
-import net.minecraft.entity.player.PlayerAbilities;
 import net.minecraft.entity.vehicle.BoatEntity;
 import net.minecraft.network.packet.Packet;
 import net.minecraft.util.math.MathHelper;
@@ -76,6 +75,8 @@ public MixinClientPlayerEntity(ClientWorld world, GameProfile profile) {
     @Shadow
     public abstract void setClientPermissionLevel(int clientPermissionLevel);
 
+    @Shadow private boolean inSneakingPose;
+
     @WrapWithCondition(method = "tickMovement", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/network/ClientPlayerEntity;jump()V"))
     private boolean dontJumpBeforeFlying(ClientPlayerEntity instance) {
         return ProtocolTranslator.getTargetVersion().newerThanOrEqualTo(ProtocolVersion.v1_20_5);
@@ -184,9 +185,11 @@ private boolean dontAllowSneakingWhileSwimming(ClientPlayerEntity instance) {
         return ProtocolTranslator.getTargetVersion().newerThan(ProtocolVersion.v1_14_1) && instance.isSwimming();
     }
 
-    @Redirect(method = "tickMovement", at = @At(value = "FIELD", target = "Lnet/minecraft/entity/player/PlayerAbilities;flying:Z", ordinal = 0))
-    private boolean allowSneakingWhileFlying(PlayerAbilities instance) {
-        return ProtocolTranslator.getTargetVersion().newerThan(ProtocolVersion.v1_13_2) && instance.flying;
+    @Inject(method = "tickMovement", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/network/ClientPlayerEntity;getAttributeValue(Lnet/minecraft/registry/entry/RegistryEntry;)D"))
+    private void removeSneakingConditions(CallbackInfo ci) { // Allows sneaking while flying, inside blocks and vehicles
+        if (ProtocolTranslator.getTargetVersion().olderThanOrEqualTo(ProtocolVersion.v1_13_2)) {
+            this.inSneakingPose = this.isSneaking() && !this.isSleeping();
+        }
     }
 
     @Redirect(method = "tickMovement", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/network/ClientPlayerEntity;isTouchingWater()Z"))