Input P2P tunnels can now be assigned a new frequency. (#3765)

Shift right clicking an existing tunnel only allowed to copied the
stored frequency.

When shift right clicking now and the stored frequency being the same as
already stored one, it will now create a new one and save it to the memory
card. In other words doubling clicking will reset now, otherwise the old
behaviour is still kept.

src/main/java/appeng/parts/p2p/PartP2PTunnel.java

@@ -336,15 +336,18 @@ public abstract class PartP2PTunnel<T extends PartP2PTunnel> extends PartBasicSt
 			}
 
 			final IMemoryCard mc = (IMemoryCard) is.getItem();
-			final NBTTagCompound data = new NBTTagCompound();
+			final NBTTagCompound data = mc.getData( is );
+			final short storedFrequency = data.getShort( "freq" );
 
 			short newFreq = this.getFrequency();
 			final boolean wasOutput = this.isOutput();
 			this.setOutput( false );
 
+			final boolean needsNewFrequency = wasOutput || this.getFrequency() == 0 || storedFrequency == newFreq;
+
 			try
 			{
-				if( wasOutput || this.getFrequency() == 0 )
+				if( needsNewFrequency )
 				{
 					newFreq = this.getProxy().getP2P().newFrequency();
 				}
@@ -373,7 +376,14 @@ public abstract class PartP2PTunnel<T extends PartP2PTunnel> extends PartBasicSt
 			data.setIntArray( "colorCode", colorCode );
 
 			mc.setMemoryCardContents( is, type + ".name", data );
-			mc.notifyUser( player, MemoryCardMessages.SETTINGS_SAVED );
+			if( needsNewFrequency )
+			{
+				mc.notifyUser( player, MemoryCardMessages.SETTINGS_RESET );
+			}
+			else
+			{
+				mc.notifyUser( player, MemoryCardMessages.SETTINGS_SAVED );
+			}
 			return true;
 		}
 		return false;