Allow storing multiple replacements on SpellCheckResult

components/spellcheck/renderer/spellcheck.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/spellcheck/renderer/spellcheck.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <utility>
@@ skipping 455 matching lines @@
   std::vector<WebTextCheckingResult> results;
   for (const SpellCheckResult& spellcheck_result : spellcheck_results) {
     DCHECK_LE(static_cast<size_t>(spellcheck_result.location),
               line_text.length());
     DCHECK_LE(static_cast<size_t>(spellcheck_result.location +
                                   spellcheck_result.length),
               line_text.length());
 
     const base::string16& misspelled_word =
         line_text.substr(spellcheck_result.location, spellcheck_result.length);
-    base::string16 replacement = spellcheck_result.replacement;
+    const std::vector<base::string16>& replacements =
+        spellcheck_result.replacements;
     SpellCheckResult::Decoration decoration = spellcheck_result.decoration;
 
     // Ignore words in custom dictionary.
     if (custom_dictionary_.SpellCheckWord(misspelled_word, 0,
                                           misspelled_word.length())) {
       continue;
     }
 
-    // Use the same types of appostrophes as in the mispelled word.
-    PreserveOriginalApostropheTypes(misspelled_word, &replacement);
+    std::vector<WebString> replacements_adjusted;
+    for (base::string16 replacement : replacements) {
+      // Use the same types of appostrophes as in the mispelled word.
+      PreserveOriginalApostropheTypes(misspelled_word, &replacement);
 
-    // Ignore misspellings due the typographical apostrophe.
-    if (misspelled_word == replacement)
+      // Ignore suggestions that are just changing the apostrophe type
+      // (straight vs. typographical)
+      if (replacement == misspelled_word)
+        continue;
+
+      replacements_adjusted.push_back(WebString::FromUTF16(replacement));
+    }
+
+    if (replacements_adjusted.empty())

[Xiaocheng, 2017/05/29 04:00:31]

This is the culprit of crbug.com/727172:

If |spellcheck_result| doesn't contain any replacement, the old implementation
still returns the result, but the new implementation throws the result away due
to an empty |replacements_adjusted|.

Note that Mac always creates results with empty replacement:

https://cs.chromium.org/chromium/src/components/spellcheck/browser/spellcheck...

       continue;
 
     if (filter == USE_NATIVE_CHECKER) {
       // Double-check misspelled words with out spellchecker and attach grammar
       // markers to them if our spellchecker tells us they are correct words,
       // i.e. they are probably contextually-misspelled words.
       int unused_misspelling_start = 0;
       int unused_misspelling_length = 0;
       if (decoration == SpellCheckResult::SPELLING &&
           SpellCheckWord(misspelled_word.c_str(), kNoOffset,
                          misspelled_word.length(), kNoTag,
                          &unused_misspelling_start, &unused_misspelling_length,
                          nullptr)) {
         decoration = SpellCheckResult::GRAMMAR;
       }
     }
 
-    results.push_back(WebTextCheckingResult(
-        static_cast<WebTextDecorationType>(decoration),
-        line_offset + spellcheck_result.location, spellcheck_result.length,
-        blink::WebString::FromUTF16(replacement)));
+    results.push_back(
+        WebTextCheckingResult(static_cast<WebTextDecorationType>(decoration),
+                              line_offset + spellcheck_result.location,
+                              spellcheck_result.length, replacements_adjusted));
   }
 
   textcheck_results->Assign(results);
 }
 
 bool SpellCheck::IsSpellcheckEnabled() {
 #if defined(OS_ANDROID)
   if (!spellcheck::IsAndroidSpellCheckFeatureEnabled()) return false;
 #endif
   return spellcheck_enabled_;
 }