Log each sync attempt when our blockchain isn't up to date

Without this it can appear as though nothing is happening for a while after the app launches.

src/main/java/org/qortal/controller/Synchronizer.java

@@ -509,9 +509,19 @@ public SynchronizationResult synchronize(Peer peer, boolean force) throws Interr
 					byte[] peersLastBlockSignature = peerChainTipData.getLastBlockSignature();
 
 					byte[] ourLastBlockSignature = ourLatestBlockData.getSignature();
-					LOGGER.debug(String.format("Synchronizing with peer %s at height %d, sig %.8s, ts %d; our height %d, sig %.8s, ts %d", peer,
+					String syncString = String.format("Synchronizing with peer %s at height %d, sig %.8s, ts %d; our height %d, sig %.8s, ts %d", peer,
 							peerHeight, Base58.encode(peersLastBlockSignature), peer.getChainTipData().getLastBlockTimestamp(),
-							ourInitialHeight, Base58.encode(ourLastBlockSignature), ourLatestBlockData.getTimestamp()));
+							ourInitialHeight, Base58.encode(ourLastBlockSignature), ourLatestBlockData.getTimestamp());
+
+					// If our latest block is very old, we should log that we're attempting to sync with a peer
+					// Otherwise, it can appear as though nothing is happening for a while after launch
+					final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
+					if (minLatestBlockTimestamp != null && ourLatestBlockData.getTimestamp() < minLatestBlockTimestamp) {
+						LOGGER.info(syncString);
+					}
+					else {
+						LOGGER.debug(syncString);
+					}
 
 					// Reset last re-org size as we are starting a new sync round
 					this.lastReorgSize = 0;