Prevent crash

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

@@ -103,7 +103,7 @@ public class HtmlEx {
 
         int next;
         for (int i = 0; i < len; i = next) {
-            next = text.nextSpanTransition(i, len, ParagraphStyle.class);
+            next = nextSpanTransition(text, i, len, ParagraphStyle.class);
             ParagraphStyle[] style = getSpans(text, i, next, ParagraphStyle.class);
             String elements = " ";
             boolean needDiv = false;
@@ -138,8 +138,8 @@ public class HtmlEx {
                                   int option) {
         int next;
         for (int i = start; i < end; i = next) {
-            int n1 = text.nextSpanTransition(i, end, QuoteSpan.class);
-            int n2 = text.nextSpanTransition(i, end, eu.faircode.email.IndentSpan.class);
+            int n1 = nextSpanTransition(text, i, end, QuoteSpan.class);
+            int n2 = nextSpanTransition(text, i, end, eu.faircode.email.IndentSpan.class);
             next = Math.min(n1, n2);
             try {
                 List<Object> spans = new ArrayList<>();
@@ -375,7 +375,7 @@ public class HtmlEx {
     private /* static */ void withinParagraph(StringBuilder out, Spanned text, int start, int end) {
         int next;
         for (int i = start; i < end; i = next) {
-            next = text.nextSpanTransition(i, end, CharacterStyle.class);
+            next = nextSpanTransition(text, i, end, CharacterStyle.class);
             try {
                 CharacterStyle[] style = getSpans(text, i, next, CharacterStyle.class);
 
@@ -578,7 +578,16 @@ public class HtmlEx {
         }
     }
 
-    private <T> T[] getSpans(Spanned text, int start, int end, Class<T> type) {
+    private static int nextSpanTransition(Spanned text, int start, int limit, Class type) {
+        try {
+            return text.nextSpanTransition(start, limit, type);
+        } catch (Throwable ex) {
+            Log.e(ex);
+            return limit;
+        }
+    }
+
+    private static <T> T[] getSpans(Spanned text, int start, int end, Class<T> type) {
         try {
             return text.getSpans(start, end, type);
         } catch (Throwable ex) {