Allow setting of minBlock on sending (#3921)

* minBlock value formatting

* Allow Contract execute to specify minBock

* Transfer allows minBlock

* Cleanups

* Check errors, verify via testing

* Display Submitted/Submission block in MethodDecoding

js/src/ui/MethodDecoding/methodDecoding.js

@@ -122,10 +122,24 @@ class MethodDecoding extends Component {
         </span>
         <span> for a total transaction value of </span>
         <span className={ styles.highlight }>{ this.renderEtherValue(gasValue) }</span>
+        { this.renderMinBlock() }
       </div>
     );
   }
 
+  renderMinBlock () {
+    const { historic, transaction } = this.props;
+    const { minBlock } = transaction;
+
+    if (!minBlock || minBlock.eq(0)) {
+      return null;
+    }
+
+    return (
+      <span>, { historic ? 'Submitted' : 'Submission' } at block <span className={ styles.highlight }>#{ minBlock.toFormat(0) }</span></span>
+    );
+  }
+
   renderAction () {
     const { token } = this.props;
     const { methodName, methodInputs, methodSignature, isDeploy, isReceived, isContract } = this.state;