qml: show invoices/requests lists through long press

I think we can re-enable the requests list, because requests
are now created explicitly by pressing the create request button.

Since this is an advanced feature, it should not be in the way of
people who do not want to see it. Here is a solution that might
work.

electrum/gui/qml/components/SendDialog.qml

@@ -48,18 +48,6 @@ ElDialog {
         ButtonContainer {
             Layout.fillWidth: true
 
-            FlatButton {
-                Layout.fillWidth: true
-                Layout.preferredWidth: 1
-                icon.source: '../../icons/tab_receive.png'
-                text: qsTr('Saved Invoices')
-                enabled: Daemon.currentWallet.invoiceModel.rowCount() // TODO: only count non-expired
-                onClicked: {
-                    dialog.close()
-                    app.stack.push(Qt.resolvedUrl('Invoices.qml'))
-                }
-            }
-
             FlatButton {
                 Layout.fillWidth: true
                 Layout.preferredWidth: 1

electrum/gui/qml/components/WalletMainView.qml

@@ -188,8 +188,10 @@ Item {
                     var dialog = receiveDetailsDialog.createObject(mainView)
                     dialog.open()
                 }
+                onPressAndHold: {
+                    app.stack.push(Qt.resolvedUrl('ReceiveRequests.qml'))
+                }
             }
-
             FlatButton {
                 visible: Daemon.currentWallet
                 Layout.fillWidth: true
@@ -197,6 +199,9 @@ Item {
                 icon.source: '../../icons/tab_send.png'
                 text: qsTr('Send')
                 onClicked: openSendDialog()
+                onPressAndHold: {
+                    app.stack.push(Qt.resolvedUrl('Invoices.qml'))
+                }
             }
         }
     }