should always trigger ui upadte, no need to check last is empty.

Author: wengxt

src/skk.cpp

@@ -754,10 +754,7 @@ void SkkState::updateUI() {
         inputPanel.reset();
         ic_->updatePreedit();
         engine_->instance()->showInputMethodInformation(ic_);
-        if (!lastIsEmpty) {
-            // Preedit was cleared.
-            ic_->updateUserInterface(UserInterfaceComponent::InputPanel);
-        }
+        ic_->updateUserInterface(UserInterfaceComponent::InputPanel);
         return;
     }