Only apply depth if appearedAtChainHeight is not invalid (-1)

core/src/main/java/org/bitcoinj/core/TransactionConfidence.java

@@ -112,12 +112,12 @@ public enum ConfidenceType {
          * If a transaction hasn't been broadcast yet, or there's no record of it, its confidence is UNKNOWN.
          */
         UNKNOWN(0);
-        
+
         private int value;
         ConfidenceType(int value) {
             this.value = value;
         }
-        
+
         public int getValue() {
             return value;
         }
@@ -262,7 +262,7 @@ public synchronized ConfidenceType getConfidenceType() {
     }
 
     /**
-     * Called by other objects in the system, like a {@link Wallet}, when new information about the confidence of a 
+     * Called by other objects in the system, like a {@link Wallet}, when new information about the confidence of a
      * transaction becomes available.
      */
     public synchronized void setConfidenceType(ConfidenceType confidenceType) {
@@ -369,7 +369,9 @@ public synchronized String toString() {
      * @return the new depth
      */
     public synchronized int incrementDepthInBlocks(int height) {
-        this.depth = height - getAppearedAtChainHeight() + 1;
+        if (getAppearedAtChainHeight() != -1)
+            this.depth = height - getAppearedAtChainHeight() + 1;
+
         return this.depth;
     }
 
@@ -379,7 +381,7 @@ public synchronized int incrementDepthInBlocks(int height) {
      * considers a transaction impractical to reverse after 6 blocks, but as of EOY 2011 network
      * security is high enough that often only one block is considered enough even for high value transactions. For low
      * value transactions like songs, or other cheap items, no blocks at all may be necessary.</p>
-     *     
+     *
      * <p>If the transaction appears in the top block, the depth is one. If it's anything else (pending, dead, unknown)
      * the depth is zero.</p>
      */