Don't skip blanks in preserveWhiteSpace descenders

Fixes #1776.

Regressed in f4d00c2

CHANGES

@@ -6,6 +6,10 @@ jsoup changelog
     internal buffer size is read.
     <https://github.com/jhy/jsoup/issues/1774>
 
+  * Bugfix: when serializing HTML, newlines in elements descending from a pre tag were incorrectly skipped. That caused
+    what should have been preformatted output to instead be a run of text.
+    <https://github.com/jhy/jsoup/issues/1776>
+
 *** Release 1.15.1 [2022-May-15]
   * Change: removed previously deprecated methods and classes (including org.jsoup.safety.Whitelist; use
     org.jsoup.safety.Safelist instead).

src/main/java/org/jsoup/nodes/TextNode.java

@@ -85,14 +85,14 @@ void outerHtmlHead(Appendable accum, int depth, Document.OutputSettings out) thr
         final Element parent = parentNode instanceof Element ? ((Element) parentNode) : null;
         final boolean parentIndent = parent != null && parent.shouldIndent(out);
         final boolean blank = isBlank();
+        final boolean normaliseWhite = prettyPrint && !Element.preserveWhitespace(parentNode);
 
-        if (parentIndent && StringUtil.startsWithNewline(coreValue()) && blank) // we are skippable whitespace
+        if (normaliseWhite && parentIndent && StringUtil.startsWithNewline(coreValue()) && blank) // we are skippable whitespace
             return;
 
         if (prettyPrint && ((siblingIndex == 0 && parent != null && parent.tag().formatAsBlock() && !blank) || (out.outline() && siblingNodes().size()>0 && !blank) ))
             indent(accum, depth, out);
 
-        final boolean normaliseWhite = prettyPrint && !Element.preserveWhitespace(parentNode);
         final boolean stripWhite = prettyPrint && parentNode instanceof Document;
         Entities.escape(accum, coreValue(), out, false, normaliseWhite, stripWhite);
     }

src/test/java/org/jsoup/nodes/ElementTest.java

@@ -2216,4 +2216,42 @@ void prettySerializationRoundTrips(Document.OutputSettings settings) {
         assertEquals("Hello World", p.text());
         assertEquals("Hello\nWorld", p.wholeText());
     }
+
+    @Test void preformatFlowsToChildTextNodes() {
+        // https://github.com/jhy/jsoup/issues/1776
+        String html = "<div><pre>One\n<span>\nTwo</span>\n <span>  \nThree</span>\n <span>Four <span>Five</span>\n  Six\n</pre>";
+        Document doc = Jsoup.parse(html);
+        doc.outputSettings().indentAmount(2).prettyPrint(true);
+
+        Element div = doc.selectFirst("div");
+        assertNotNull(div);
+        String actual = div.outerHtml();
+        String expect = "<div>\n" +
+            "  <pre>One\n" +
+            "<span>\n" +
+            "Two</span>\n" +
+            " <span>  \n" +
+            "Three</span>\n" +
+            " <span>Four <span>Five</span>\n" +
+            "  Six\n" +
+            "</span></pre>\n" +
+            "</div>";
+        assertEquals(expect, actual);
+
+        String expectText = "One\n" +
+            "\n" +
+            "Two\n" +
+            "   \n" +
+            "Three\n" +
+            " Four Five\n" +
+            "  Six\n";
+        assertEquals(expectText, div.wholeText());
+
+        String expectOwn = "One\n" +
+            "\n" +
+            " \n" +
+            " ";
+        assertEquals(expectOwn, div.child(0).wholeOwnText());
+
+    }
 }