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HtmlUnit 2.57.0 asNormalizedText() is incorrect when isCSSEnabled is false #439

Description

@jeffcjohnson

In 2.57.0, asNormalizedText() is missing linefeeds on some block layout tags if CSS is disabled, even when no CSS is present in the HTML.

============= webClient.options.isCssEnabled = true =============
p 
br
p
p 
br 
br 
br
p
============= webClient.options.isCssEnabled = false =============
p 
br p p 
br 
br 
br p
import com.gargoylesoftware.htmlunit.WebClient
import com.gargoylesoftware.htmlunit.html.HtmlPage

fun testAsNormalizedTextWithCssDisabled() {
    val content = """
        <div>
            <p>p
                <br>br
            </p>
            <p>p</p>
            <p>p
                <br>br
                <br>br
                <br>br
            </p>
            <p>p</p>
        </div>
    """.trimIndent()

    val webClient = WebClient()

    webClient.loadHtmlCodeIntoCurrentWindow(content)
    val page = webClient.currentWindow.enclosedPage as HtmlPage

    println("============= webClient.options.isCssEnabled = true =============")
    webClient.options.isCssEnabled = true  // default is true
    println(page.asNormalizedText())

    println("============= webClient.options.isCssEnabled = false =============")
    webClient.options.isCssEnabled = false
    println(page.asNormalizedText())
}

fun main() {
    testAsNormalizedTextWithCssDisabled()
}

PS: thanks for HtmlUnit, it is awesome!

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