Defer spelling correction with apostrophe

When typing a contraction (such as "doesn't") we don't want a spell
right after the apostrophe, as this will create a false temporary red
underline, and the span split also breaks a kern pair causing text to
shift. This patch detects the case where the cursor is immediately after
such a word and suppresses correction in that case.

Bug: 17641350

Change-Id: I4d09576a31df551c96f820242fd2cbc675506dae

core/java/android/widget/SpellChecker.java

@@ -276,13 +276,19 @@ public class SpellChecker implements SpellCheckerSessionListener {
 
             // Do not check this word if the user is currently editing it
             final boolean isEditing;
+
+            // Defer spell check when typing a word with an interior apostrophe.
+            // TODO: a better solution to this would be to make the word
+            // iterator locale-sensitive and include the apostrophe in
+            // languages that use it (such as English).
+            final boolean apostrophe = (selectionStart == end + 1 && editable.charAt(end) == '\'');
             if (mIsSentenceSpellCheckSupported) {
                 // Allow the overlap of the cursor and the first boundary of the spell check span
                 // no to skip the spell check of the following word because the
                 // following word will never be spell-checked even if the user finishes composing
-                isEditing = selectionEnd <= start || selectionStart > end;
+                isEditing = !apostrophe && (selectionEnd <= start || selectionStart > end);
             } else {
-                isEditing = selectionEnd < start || selectionStart > end;
+                isEditing = !apostrophe && (selectionEnd < start || selectionStart > end);
             }
             if (start >= 0 && end > start && isEditing) {
                 spellCheckSpan.setSpellCheckInProgress(true);