Don't override application-specified completions

...for any given input.
This is not necessarily the best fix, but it's simple and
it works well enough.

Bug: 15869703
Change-Id: I54b262be8bdbec37031dea655c60a5573b3d8ec3

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

@@ -1001,6 +1001,9 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         if (!mSettings.getCurrent().isApplicationSpecifiedCompletionsOn()) {
             return;
         }
+        // If we have an update request in flight, we need to cancel it so it does not override
+        // these completions.
+        mHandler.cancelUpdateSuggestionStrip();
         if (applicationSpecifiedCompletions == null) {
             setNeutralSuggestionStrip();
             return;