Fix a bug in sentence detection when input is too long.

When the unchecked length of the current sentence is too long, the
spell checker should check the first MAX_SENTENCE_LGNTH characters of
the unchecked part. In this case, detectSentenceBOundary should return
[textChangesStart, textChangeStart + MAX_SENTENCE_LENGTH)

Fix: 188875278

Test: manual test
Change-Id: I31847aed2d564f7bc1ff43c83adae3bb7c99c0d1

1 files changed, 2 insertions, 2 deletions

diff --git a/core/java/android/widget/SpellChecker.java b/core/java/android/widget/SpellChecker.java
index 7c04b1cc195b..2280d7cfd11c 100644
--- a/core/java/android/widget/SpellChecker.java
+++ b/core/java/android/widget/SpellChecker.java
@@ -821,7 +821,7 @@ public class SpellChecker implements SpellCheckerSessionListener {
             // The offset should be rounded up to word boundary.
             int uncheckedLength = sentenceEnd - textChangeStart;
             if (uncheckedLength > MAX_SENTENCE_LENGTH) {
-                sentenceEnd = findSeparator(sequence, sentenceStart + MAX_SENTENCE_LENGTH,
+                sentenceEnd = findSeparator(sequence, textChangeStart + MAX_SENTENCE_LENGTH,
                         sentenceEnd);
                 sentenceStart = roundUpToWordStart(sequence, textChangeStart, sentenceStart);
             } else {
@@ -829,7 +829,7 @@ public class SpellChecker implements SpellCheckerSessionListener {
                         sentenceStart);
             }
         }
-        return new Range(sentenceStart, sentenceEnd);
+        return new Range<>(sentenceStart, Math.max(sentenceStart, sentenceEnd));
     }
 
     private int roundUpToWordStart(CharSequence sequence, int position, int frontBoundary) {