Update recent games list & remove redundant recent games from ini file

UI/GameSettingsScreen.cpp

@@ -48,6 +48,7 @@ namespace MainWindow {
 		WM_USER_LOG_STATUS_CHANGED = WM_USER + 101,
 		WM_USER_ATRAC_STATUS_CHANGED = WM_USER + 102,
 		WM_USER_UPDATE_UI = WM_USER + 103,
+		WM_USER_RECREATE_RECENTLIST = WM_USER + 104,
 	};
 	extern HWND hwndMain;
 }
@@ -398,6 +399,7 @@ void GameSettingsScreen::CreateViews() {
 
 UI::EventReturn GameSettingsScreen::OnClearRecents(UI::EventParams &e) {
 	g_Config.recentIsos.clear();
+	clearrecentlist_=true; // set true to send clear_recent_list message
 
 	return UI::EVENT_DONE;
 }
@@ -489,6 +491,11 @@ UI::EventReturn GameSettingsScreen::OnBack(UI::EventParams &e) {
 
 	KeyMap::UpdateConfirmCancelKeys();
 
+	if (clearrecentlist_){
+		// clear the recent game list on MainWindow.
+		PostMessage(MainWindow::hwndMain, MainWindow::WM_USER_RECREATE_RECENTLIST, 0, 0);
+		clearrecentlist_ = false; }
+
 	return UI::EVENT_DONE;
 }