qml: TxDetails small form-factor fix, wrap buttons to below fee-bump text if width is constrained

electrum/gui/qml/components/TxDetails.qml

@@ -138,17 +138,23 @@ Pane {
                         borderColor: constants.colorWarning
                         visible: txdetails.canBump || txdetails.canCpfp || txdetails.canCancel
 
-                        RowLayout {
+                        GridLayout {
                             width: parent.width
+                            columns: actionButtonsLayout.implicitWidth > parent.width/2
+                                ? 1
+                                : 2
                             Label {
                                 Layout.fillWidth: true
-                                text: qsTr('This transaction is still unconfirmed.') + '\n' +
+                                text: qsTr('This transaction is still unconfirmed.') + '\n' + (txdetails.canCancel
-                                qsTr('You can increase fees to speed up the transaction, or cancel this transaction')
+                                    ? qsTr('You can increase fees to speed up the transaction, or cancel this transaction')
+                                    : qsTr('You can increase fees to speed up the transaction'))
                                 wrapMode: Text.Wrap
                             }
                             ColumnLayout {
+                                id: actionButtonsLayout
                                 Layout.alignment: Qt.AlignHCenter
                                 Pane {
+                                    Layout.alignment: Qt.AlignHCenter
                                     background: Rectangle { color: Material.dialogColor }
                                     padding: 0
                                     visible: txdetails.canBump || txdetails.canCpfp
@@ -168,6 +174,7 @@ Pane {
                                     }
                                 }
                                 Pane {
+                                    Layout.alignment: Qt.AlignHCenter
                                     background: Rectangle { color: Material.dialogColor }
                                     padding: 0
                                     visible: txdetails.canCancel