fix lossing signatured after from-toObj roundtrip

lib/TransactionBuilder.js

@@ -834,6 +834,17 @@ TransactionBuilder.prototype.toObj = function() {
   return ret;
 };
 
+TransactionBuilder.prototype._setScriptSig = function(inScriptSig) {
+  this.vanilla.scriptSig = inScriptSig;
+
+  for (var i in inScriptSig) {
+    this.tx.ins[i].s = new Buffer(inScriptSig[i], 'hex');
+    var scriptSig = new Script(this.tx.ins[i].s);
+    if (scriptSig.finishedMultiSig() !== false)
+      this.inputsSigned++;
+  }
+};
+
 // fromObj
 // -------
 // Returns a TransactionBuilder instance given
@@ -855,12 +866,8 @@ TransactionBuilder.fromObj = function(data) {
     if (data.outs) {
       b.setOutputs(data.outs);
 
-      for (var i in data.scriptSig) {
+      if (data.scriptSig) {
-        b.tx.ins[i].s = new Buffer(data.scriptSig[i], 'hex');
+        b._setScriptSig(data.scriptSig);
-
-        var scriptSig = new Script(b.tx.ins[i].s);
-        if (scriptSig.finishedMultiSig() !== false)
-          b.inputsSigned++;
       }
     }
   }

test/test.TransactionBuilder.js

@@ -919,6 +919,15 @@ describe('TransactionBuilder', function() {
       util.valueToBigInt(tx.outs[1].v).cmp(2990000).should.equal(0);
     });
 
+    it('#clone roundtrip, signed', function() {
+      var b = getBuilder3();
+      b.sign(testdata.dataUnspentSign.keyStrings);
+      b.isFullySigned().should.equal(true);
+
+      var b2 = b.clone().clone().clone();
+      b2.isFullySigned().should.equal(true);
+    });
+
     it('#toObj #fromObj roundtrip, step signatures p2sh/p2pubkeyhash', function() {
       var b = getP2shBuilder(1);
 
@@ -1204,8 +1213,5 @@ describe('TransactionBuilder', function() {
         b2.merge(b)
       }).should.throw('incompatible');
     });
-
-
-
   });
 });