Cleanup whatsthis texts

now the whatsthis text and the tooltip texts are the same widget,
follow up with placing the texts more nicely

src/kgdifficulty.cpp

@@ -376,7 +376,6 @@ void KgDifficultyGUI::init(KXmlGuiWindow* window, KgDifficulty* difficulty)
 	const QIcon icon = QIcon::fromTheme(QStringLiteral("games-difficult"));
 	KSelectAction* menu = new KgDifficultyGUI::Menu(icon, i18nc("Game difficulty level", "Difficulty"), window);
 	menu->setToolTip(i18n("Set the difficulty level"));
-	menu->setWhatsThis(i18n("Set the difficulty level of the game."));
 	QObject::connect(menu, &KSelectAction::indexTriggered, selector, &Selector::slotActivated);
 	QObject::connect(difficulty, &KgDifficulty::editableChanged, menu, &QAction::setEnabled);
 	QObject::connect(selector, &Selector::signalSelected, menu, &KSelectAction::setCurrentItem);

src/kstandardgameaction.cpp

@@ -39,7 +39,7 @@ struct KStandardGameActionInfo
 
 const KStandardGameActionInfo g_rgActionInfo[] = {
 // "game" menu
-    { KStandardGameAction::New, KStandardShortcut::New, 0, "game_new", I18N_NOOP2("new game", "&New"), I18N_NOOP("Start a new game."), "document-new", I18N_NOOP("Start a new game") },
+    { KStandardGameAction::New, KStandardShortcut::New, 0, "game_new", I18N_NOOP2("new game", "&New"), nullptr, "document-new", I18N_NOOP("Start a new game.") },
     { KStandardGameAction::Load, KStandardShortcut::Open, 0, "game_load", nullptr, I18N_NOOP("&Load..."), nullptr, "document-open", I18N_NOOP("Open a saved game...") },
     { KStandardGameAction::LoadRecent, KStandardShortcut::AccelNone, 0, "game_load_recent", nullptr, I18N_NOOP("Load &Recent"), nullptr, nullptr, I18N_NOOP("Open a recently saved game...") },
     { KStandardGameAction::Restart, KStandardShortcut::Reload, 0, "game_restart", nullptr, I18N_NOOP("Restart &Game"), nullptr, "view-refresh", I18N_NOOP("Restart the game") },

src/private/kgamedifficulty.cpp

@@ -107,7 +107,6 @@ void KGameDifficultyPrivate::init(KXmlGuiWindow* window, const QObject* recvr, c
 
 	m_menu = new KSelectAction(QIcon::fromTheme( QStringLiteral( "games-difficult") ), i18nc("Game difficulty level", "Difficulty" ), window);
 	m_menu->setToolTip(i18n("Set the difficulty level"));
-	m_menu->setWhatsThis(i18n("Set the difficulty level of the game."));
 	connect(m_menu, &KSelectAction::indexTriggered,
 	        this, &KGameDifficultyPrivate::changeSelection);
 	m_menu->setObjectName( QStringLiteral("options_game_difficulty" ));
@@ -116,7 +115,6 @@ void KGameDifficultyPrivate::init(KXmlGuiWindow* window, const QObject* recvr, c
 	setParent(window);
 
 	m_comboBox = new KComboBox(window);
-	m_comboBox->setToolTip(i18n("Difficulty"));
 	connect(m_comboBox, QOverload<int>::of(&QComboBox::activated),
 	        this, &KGameDifficultyPrivate::changeSelection);
 	window->statusBar()->addPermanentWidget(m_comboBox);
@@ -295,9 +293,9 @@ void KGameDifficulty::setRestartOnChange(onChange restart)
 
 	self()->d->m_restartOnChange = restart;
 	if (restart==RestartOnChange)
-		self()->d->m_comboBox->setWhatsThis(i18n("Select the <b>difficulty</b> of the game.<br />If you change the difficulty level while a game is running, you will have to cancel it and start a new one."));
+		self()->d->m_comboBox->setToolTip(i18n("Select the <b>difficulty</b> of the game.<br />If you change the difficulty level while a game is running, you will have to cancel it and start a new one."));
 	else
-		self()->d->m_comboBox->setWhatsThis(i18n("Select the <b>difficulty</b> of the game.<br />You can change the difficulty level during a running game."));
+		self()->d->m_comboBox->setToolTip(i18n("Select the <b>difficulty</b> of the game.<br />You can change the difficulty level during a running game."));
 
 }