Test that wrap() can't overflow

Related to #1864

CHANGES

@@ -47,6 +47,10 @@ Release 1.15.4 [PENDING]
   * Bugfix: fixed an issue in Safelist.removeAttributes which could throw a ConcurrentModificationException when using
     the ":all" pseudo-attribute.
 
+  * Bugfix: given extremely deeply nested HTML, a number of methods in Element could throw a StackOverflowError due
+    to excessive recursion. Namely: #data(), #hasText(), #parents(), and #wrap(html).
+    <https://github.com/jhy/jsoup/issues/1864>
+
   * Change: deprecated the unused Document#normalise() method. Normalization occurs during the HTML tree construction,
     and no longer as a distinct phase.
 

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

@@ -119,4 +119,19 @@ public void testFastReparentExistingContent() {
         assertEquals(num+2, parents.size()); // +2 for html and body
         assertEquals(doc, el.ownerDocument());
     }
+
+    @Test void wrapNoOverflow() {
+        // deepChild was recursive, so could overflow if presented with a fairly insane wrap
+        Document doc = new Document("https://example.com/");
+        Element el = doc.body().appendElement("p");
+        int num = 50000;
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i <= num; i++) {
+            sb.append("<div>");
+        }
+        el.wrap(sb.toString());
+        String html = doc.body().html();
+        assertTrue(html.startsWith("<div>"));
+        assertEquals(num + 3, el.parents().size());
+    }
 }