Fix a bug that happens upon a race condition

Bug: 10848621
Change-Id: If5ff7f001e69af005a5ff9ab3e9f630b88a0a858

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -2746,6 +2746,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         final TextRange range = mConnection.getWordRangeAtCursor(currentSettings.mWordSeparators,
                 0 /* additionalPrecedingWordsCount */);
         if (null == range) return; // Happens if we don't have an input connection at all
+        if (range.length() <= 0) return; // Race condition. No text to resume on, so bail out.
         // If for some strange reason (editor bug or so) we measure the text before the cursor as
         // longer than what the entire text is supposed to be, the safe thing to do is bail out.
         final int numberOfCharsInWordBeforeCursor = range.getNumberOfCharsInWordBeforeCursor();

java/src/com/android/inputmethod/latin/utils/TextRange.java

@@ -40,6 +40,10 @@ public final class TextRange {
         return mWordAtCursorEndIndex - mCursorIndex;
     }
 
+    public int length() {
+        return mWord.length();
+    }
+
     /**
      * Gets the suggestion spans that are put squarely on the word, with the exact start
      * and end of the span matching the boundaries of the word.