fix the strange behavior of Korean ime composition window.

Because Hangul is a combination character, WM_IME_STARTCOMPOSITION is only called once when the IME input is started, so the position of the composition window is strange.

Therefore, I solved the problem by controlling the state of characters combined using WM_IME_COMPOSITION and WM_IME_CHAR.

We have also improved to support other IME languages such as Chinese and Japanese.

source/gui/widgets/combox.cpp

@@ -773,6 +773,13 @@ namespace nana
 				API::dev::lazy_refresh();
 			}
 
+			void trigger::key_ime(graph_reference, const arg_ime& arg)
+			{
+				drawer_->editor()->respond_ime(arg);
+				if (drawer_->editor()->try_refresh())
+					API::dev::lazy_refresh();
+			}
+
 			void trigger::key_char(graph_reference, const arg_keyboard& arg)
 			{
 				drawer_->editor()->respond_char(arg);