A float value padding causes display issue

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Templates 2.0 as T
import QtQuick.Layouts 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    T.TextField {
        clip: true
        leftPadding: 4.5
        width: 100
        height: 30
        verticalAlignment: Qt.AlignVCenter

        background: Rectangle {
            border.width: 1
            border.color: "red"
        }
    }
}

    ComboBox {
        leftPadding: 4.5
        contentItem: TextInput {
            leftPadding: 0
            clip: true
        }
    }