properly increment history index, closes PurpurMC#1472

Author: granny

patches/server/0296-Make-GUI-Great-Again.patch

@@ -108,7 +108,7 @@ index d56fab50babe37865d0a40b7088b011c8ff6af88..d21260dd1b7305949f063123b427dec1
                  /*
                  jline.console.ConsoleReader bufferedreader = DedicatedServer.this.reader;
 diff --git a/src/main/java/net/minecraft/server/gui/MinecraftServerGui.java b/src/main/java/net/minecraft/server/gui/MinecraftServerGui.java
-index dd9f611efc95f7d06fd3011fedd5d0317b1d0a85..be7b3fe2dc84493dcde9e185717b0b7c7c2e9822 100644
+index dd9f611efc95f7d06fd3011fedd5d0317b1d0a85..64e12201e164f4dc8070711605dcfcb6e56421f6 100644
 --- a/src/main/java/net/minecraft/server/gui/MinecraftServerGui.java
 +++ b/src/main/java/net/minecraft/server/gui/MinecraftServerGui.java
 @@ -43,6 +43,11 @@ public class MinecraftServerGui extends JComponent {
@@ -181,7 +181,7 @@ index dd9f611efc95f7d06fd3011fedd5d0317b1d0a85..be7b3fe2dc84493dcde9e185717b0b7c
 +                    currentCommand = jtextfield.getText();
 +                }
 +                if (historyIndex < history.size() - 1) {
-+                    jtextfield.setText(history.get(historyIndex));
++                    jtextfield.setText(history.get(++historyIndex));
 +                }
 +            }
 +        });