qml: ConfirmTxDialog styling slider, avoid running off small screens

electrum/gui/qml/components/ConfirmTxDialog.qml

@@ -174,8 +174,9 @@ ElDialog {
 
             InfoTextArea {
                 Layout.columnSpan: 2
-                Layout.preferredWidth: parent.width * 3/4
-                Layout.alignment: Qt.AlignHCenter
+                Layout.fillWidth: true
+                Layout.topMargin: constants.paddingLarge
+                Layout.bottomMargin: constants.paddingLarge
                 visible: finalizer.warning != ''
                 text: finalizer.warning
                 iconStyle: InfoTextArea.IconStyle.Warn

electrum/gui/qml/components/WalletMainView.qml

@@ -327,6 +327,10 @@ Item {
                     _confirmPaymentDialog.destroy()
                 }
             }
+            // TODO: lingering confirmPaymentDialogs can raise exceptions in
+            // the child finalizer when currentWallet disappears, but we need
+            // it long enough for the finalizer to finish..
+            // onClosed: destroy()
         }
     }