Fixes: #897 JavaDoc for setFont() augmented

- describes that setFont() only affects new content, and don't change
  existing one

openpdf/src/test/java/com/lowagie/text/ParagraphTest.java

@@ -0,0 +1,22 @@
+package com.lowagie.text;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class ParagraphTest {
+
+    @Test
+    void testParagraphInParagraphAlign() {
+        // given
+        Paragraph outer = new Paragraph("Outer\n");
+        outer.setAlignment(Element.ALIGN_LEFT);
+        Paragraph inner = new Paragraph("Inner");
+        inner.setAlignment(Element.ALIGN_RIGHT);
+        // when
+        outer.add(inner);
+        // then
+        assertThat(outer.alignment).isEqualTo(Element.ALIGN_LEFT);
+    }
+
+}