Fixed split overlap inner

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

@@ -622,9 +622,11 @@ public class StyleHelper {
             // overlap all
             if (extend)
                 edit.setSpan(span1, start, end, f);
-        } else if (start > s && end < e) {
+        } else if (start >= s && end <= e) {
             // overlap inner
+            if (s < start)
                 edit.setSpan(span1, s, start, f);
+            if (end < e)
                 edit.setSpan(span2, end, e, f);
         }
     }