Sign/Verify: clear text fields on wallet close

main.qml

@@ -1118,6 +1118,7 @@ ApplicationWindow {
             middlePanel.transferView.clearFields();
             middlePanel.receiveView.clearFields();
             middlePanel.historyView.clearFields();
+            middlePanel.advancedView.clearFields();
             // disable timers
             userInActivityTimer.running = false;
         });

pages/Advanced.qml

@@ -40,6 +40,7 @@ ColumnLayout {
     spacing: 0
     property int panelHeight: 900
     property alias miningView: stateView.miningView
+    property alias signView: stateView.signView
     property alias state: stateView.state
 
     MoneroComponents.Navbar {
@@ -146,4 +147,9 @@ ColumnLayout {
             }
         }
     }
+
+    function clearFields() {
+        signView.clearFields();
+    }
+    
 }

pages/Sign.qml

@@ -421,6 +421,16 @@ Rectangle {
         }
     }
 
+    function clearFields() {
+        verifyMessageLine.text = ""
+        signMessageLine.text = ""
+        signSignatureLine.text = ""
+        verifyAddressLine.text = ""
+        verifySignatureLine.text = ""
+        signFileLine.text = ""
+        verifyFileLine.text = ""
+     }
+
     function onPageCompleted() {
         console.log("Sign/verify page loaded");
     }