Ensure line break before line

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -3808,6 +3808,8 @@ public class HtmlHelper {
                                 boolean dashed = "true".equals(element.attr("x-dashed"));
                                 float stroke = context.getResources().getDisplayMetrics().density;
                                 float dash = (dashed ? line_dash_length : 0f);
+                                if (ssb.length() > 0 && ssb.charAt(ssb.length() - 1) != '\n')
+                                    ssb.append('\n');
                                 ssb.append("\uFFFC");  // Object replacement character
                                 setSpan(ssb, new LineSpan(colorSeparator, stroke, dash), start, ssb.length());
                                 break;