some fixes noticed during today's discussion around refs #302

* move hotkey settings in own GUI component -> easier adjustments
* some fixes for dock widgets when tab widget is shown without names (unrelated but found + fixed in same step)

src/blackgui/components/settingshotkeycomponent.h

@@ -0,0 +1,65 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_COMPONENTS_SETTINGSHOTKEYCOMPONENT_H
+#define BLACKGUI_COMPONENTS_SETTINGSHOTKEYCOMPONENT_H
+
+#include "blackgui/blackguiexport.h"
+#include "blackgui/components/enableforruntime.h"
+#include <QFrame>
+
+namespace Ui { class CSettingsHotkeyComponent; }
+
+namespace BlackGui
+{
+    namespace Components
+    {
+
+        //! Define hotkeys
+        class BLACKGUI_EXPORT CSettingsHotkeyComponent :
+            public QFrame,
+            public CEnableForRuntime
+        {
+            Q_OBJECT
+
+        public:
+            //! Constructor
+            explicit CSettingsHotkeyComponent(QWidget *parent = nullptr);
+
+            //! Destructor
+            ~CSettingsHotkeyComponent();
+
+            //! Reload settings
+            void reloadSettings();
+
+        protected:
+            //! \copydoc CRuntimeBasedComponent::runtimeHasBeenSet
+            virtual void runtimeHasBeenSet() override;
+
+        private slots:
+
+            //! Settings have been changed
+            void ps_changedSettings(uint typeValue);
+
+            //! Save the Hotkeys
+            void ps_saveHotkeys();
+
+            //! Clear single hotkey
+            void ps_clearHotkey();
+
+        private:
+            QScopedPointer<Ui::CSettingsHotkeyComponent> ui;
+        };
+
+    } // ns
+} // ns
+
+#endif // guard