[Android] Make temporary fix for Samsung spell checker giving blank results for all words

shell/platform/android/io/flutter/plugin/editing/SpellCheckPlugin.java

@@ -149,10 +149,20 @@ public void onGetSentenceSuggestions(SentenceSuggestionsInfo[] results) {
       spellCheckerSuggestionSpan.put(END_INDEX_KEY, end);
 
       ArrayList<String> suggestions = new ArrayList<String>();
+      boolean validSuggestionsFound = false;
       for (int j = 0; j < suggestionsCount; j++) {
-        suggestions.add(suggestionsInfo.getSuggestionAt(j));
+        String suggestion = suggestionsInfo.getSuggestionAt(j);
+        // TODO(camsim99): Support spell check on Samsung by retrieving accurate spell check
+        // results, then remove this check: https://github.com/flutter/flutter/issues/120608.
+        if (!suggestion.equals("")) {
+          validSuggestionsFound = true;
+          suggestions.add(suggestion);
+        }
       }
 
+      if (!validSuggestionsFound) {
+        continue;
+      }
       spellCheckerSuggestionSpan.put(SUGGESTIONS_KEY, suggestions);
       spellCheckerSuggestionSpans.add(spellCheckerSuggestionSpan);
     }

shell/platform/android/test/io/flutter/plugin/editing/SpellCheckPluginTest.java

@@ -222,4 +222,29 @@ public void onGetSentenceSuggestionsResultsWithSuccessAndResultsProperly() {
 
     verify(mockResult).success(expectedResults);
   }
+
+  @Test
+  public void onGetSentenceSuggestionsResultsWithSuccessAndNoResultsWhenSuggestionsAreInvalid() {
+    TextServicesManager fakeTextServicesManager = mock(TextServicesManager.class);
+    SpellCheckChannel fakeSpellCheckChannel = mock(SpellCheckChannel.class);
+    SpellCheckPlugin spellCheckPlugin =
+        spy(new SpellCheckPlugin(fakeTextServicesManager, fakeSpellCheckChannel));
+    MethodChannel.Result mockResult = mock(MethodChannel.Result.class);
+    spellCheckPlugin.pendingResult = mockResult;
+
+    spellCheckPlugin.onGetSentenceSuggestions(
+        new SentenceSuggestionsInfo[] {
+          new SentenceSuggestionsInfo(
+              (new SuggestionsInfo[] {
+                new SuggestionsInfo(
+                    SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO,
+                    // This is the suggestion that may be provided by the Samsung spell checker:
+                    new String[] {""})
+              }),
+              new int[] {7},
+              new int[] {5})
+        });
+
+    verify(mockResult).success(new ArrayList<HashMap<String, Object>>());
+  }
 }