Not to add invalid spell check spans
Bug: 6464197

Change-Id: I6e9d359847b200e2afae61f85eb7cfe7f179b888
diff --git a/core/java/android/widget/SpellChecker.java b/core/java/android/widget/SpellChecker.java
index e1103dd..11e15df 100644
--- a/core/java/android/widget/SpellChecker.java
+++ b/core/java/android/widget/SpellChecker.java
@@ -611,6 +611,9 @@
                     if (spellCheckEnd < start) {
                         break;
                     }
+                    if (spellCheckEnd <= spellCheckStart) {
+                        break;
+                    }
                     if (createSpellCheckSpan) {
                         addSpellCheckSpan(editable, spellCheckStart, spellCheckEnd);
                     }