Allow . in usernames

patches/server/0842-Validate-usernames.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Validate usernames
 
 
 diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
-index 33a29890435d6065a2cc4f8e8bf8209c01d5d114..0df723378b49aecacc15400db4b5f56c87a965b3 100644
+index 33a29890435d6065a2cc4f8e8bf8209c01d5d114..96593919db8b140e55fe1a120c2835b679771e92 100644
 --- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
 +++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
 @@ -230,10 +230,38 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
@@ -21,7 +21,7 @@ index 33a29890435d6065a2cc4f8e8bf8209c01d5d114..0df723378b49aecacc15400db4b5f56c
 +        for (int i = 0, len = in.length(); i < len; ++i) {
 +            char c = in.charAt(i);
 +
-+            if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (c == '_')) {
++            if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || (c == '_' || c == '.')) {
 +                continue;
 +            }
 +