Dim previously suggested words

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

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

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

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

.../src/com/android/inputmethod/voice/VoiceIMEConnector.java