Add PaperSpigot patch to fix block placement (Applies to all protocols for now, until someone finds an issue with this)

src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/Protocol1_9TO1_8.java

@@ -17,6 +17,7 @@ import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.listeners.ArmorListener;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.listeners.BlockListener;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.listeners.CommandBlockListener;
+import us.myles.ViaVersion.protocols.protocol1_9to1_8.listeners.PaperPatch;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.packets.*;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.ClientChunks;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.EntityTracker;
@@ -98,6 +99,10 @@ public class Protocol1_9TO1_8 extends Protocol {
         Bukkit.getPluginManager().registerEvents(new ArmorListener(plugin), plugin);
         Bukkit.getPluginManager().registerEvents(new CommandBlockListener(plugin), plugin);
         Bukkit.getPluginManager().registerEvents(new BlockListener(plugin), plugin);
+        if(Bukkit.getVersion().toLowerCase().contains("paper")){
+            plugin.getLogger().info("Enabling PaperSpigot patch: Fixes block placement.");
+            Bukkit.getPluginManager().registerEvents(new PaperPatch(), plugin);
+        }
     }
 
     @Override

src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/listeners/PaperPatch.java

@@ -0,0 +1,22 @@
+package us.myles.ViaVersion.protocols.protocol1_9to1_8.listeners;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockPlaceEvent;
+
+public class PaperPatch implements Listener {
+
+    /*
+    This patch is applied when Paper is detected.
+    I'm unsure of what causes this but essentially,
+    placing blocks where your standing works?
+    If there is a better fix then we'll replace this.
+     */
+
+    @EventHandler(ignoreCancelled = true)
+    public void onPlace(BlockPlaceEvent e) {
+        if (e.getPlayer().getLocation().getBlock().equals(e.getBlock())) {
+            e.setCancelled(true);
+        }
+    }
+}