Added "bitcoinjLookaheadSize" setting (default 50).

This replaces the WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ constant.

src/main/java/org/qortal/crosschain/Bitcoiny.java

@@ -62,11 +62,6 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	/** How many wallet keys to generate in each batch. */
 	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT = 3;
 
-	/** How many wallet keys to generate when using bitcoinj as the data provider.
-	 * We must use a higher value here since we are unable to request multiple batches of keys.
-	 * Without this, the bitcoinj state can be missing transactions, causing errors such as "insufficient balance". */
-	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ = 50;
-
 	/** Byte offset into raw block headers to block timestamp. */
 	private static final int TIMESTAMP_OFFSET = 4 + 32 + 32;
 
@@ -628,7 +623,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			this.keyChain = this.wallet.getActiveKeyChain();
 
 			// Set up wallet's key chain
-			this.keyChain.setLookaheadSize(Bitcoiny.WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ);
+			this.keyChain.setLookaheadSize(Settings.getInstance().getBitcoinjLookaheadSize());
 			this.keyChain.maybeLookAhead();
 		}
 

src/main/java/org/qortal/settings/Settings.java

@@ -286,9 +286,12 @@ public class Settings {
 
 	/* Foreign chains */
 
-	/** Set the number of consecutive empty addresses required before treating a wallet's transaction set as complete */
+	/** The number of consecutive empty addresses required before treating a wallet's transaction set as complete */
 	private int gapLimit = 24;
 
+	/** How many wallet keys to generate when using bitcoinj as the blockchain interface (e.g. when sending coins) */
+	private int bitcoinjLookaheadSize = 50;
+
 
 
 	// Data storage (QDN)
@@ -883,6 +886,10 @@ public class Settings {
 		return this.gapLimit;
 	}
 
+	public int getBitcoinjLookaheadSize() {
+		return bitcoinjLookaheadSize;
+	}
+
 
 	public boolean isQdnEnabled() {
 		return this.qdnEnabled;