various minor adjustments

app/dialog/preferences/tabs/preferencesgeneraltab.cpp

@@ -81,6 +81,7 @@ PreferencesGeneralTab::PreferencesGeneralTab()
 
   // General -> Default Sequence Settings
   QPushButton* default_sequence_settings = new QPushButton(tr("Default Sequence Settings"));
+  default_sequence_settings->setEnabled(false);
   connect(default_sequence_settings, SIGNAL(clicked(bool)), this, SLOT(edit_default_sequence_settings()));
   misc_general->addWidget(default_sequence_settings);
 

app/ui/style/olive-dark/style.css

@@ -18,6 +18,11 @@
 
 ***/
 
+/* Hack that forces checked QPushButtons to use dark color */
+QPushButton:checked {
+  background: #191919;
+}
+
 /* Node styling */
 NodeViewItemWidget {
   qproperty-titlebarColor: #4040a0;

app/ui/style/olive-light/palette.ini

@@ -14,4 +14,5 @@ Window=#D0D0D0
 WindowText=#000000
 
 [Disabled]
-ButtonText=#D0D0D0
+ButtonText=#808080
+Text=#808080

app/ui/style/olive-light/style.css

@@ -18,6 +18,9 @@
 
 ***/
 
+/* Hack that forces checked QPushButtons to use dark color */
+
+
 /* Node styling */
 NodeViewItemWidget {
   qproperty-titlebarColor: #a0a0ff;

app/window/mainwindow/mainmenu.cpp

@@ -193,6 +193,7 @@ MainMenu::MainMenu(QMainWindow *parent) :
   // WINDOW MENU
   //
   window_menu_ = new Menu(this, this, SLOT(WindowMenuAboutToShow()));
+  connect(window_menu_, SIGNAL(aboutToHide()), this, SLOT(WindowMenuAboutToHide()));
   window_menu_separator_ = window_menu_->addSeparator();
   window_maximize_panel_item_ = window_menu_->AddItem("maximizepanel", parent, SLOT(ToggleMaximizedPanel()), "`");
   window_lock_layout_item_ = window_menu_->AddItem("lockpanels", olive::panel_manager, SLOT(SetPanelsLocked(bool)));
@@ -363,6 +364,13 @@ void MainMenu::WindowMenuAboutToShow()
   window_lock_layout_item_->setChecked(olive::panel_manager->ArePanelsLocked());
 }
 
+void MainMenu::WindowMenuAboutToHide()
+{
+  while (window_menu_->actions().first() != window_menu_separator_) {
+    window_menu_->removeAction(window_menu_->actions().first());
+  }
+}
+
 void MainMenu::ZoomInTriggered()
 {
   olive::panel_manager->CurrentlyFocused()->ZoomIn();

app/window/mainwindow/mainmenu.h

@@ -72,6 +72,11 @@ private slots:
    */
   void WindowMenuAboutToShow();
 
+  /**
+   * @brief Slot triggered just before the Window menu hides
+   */
+  void WindowMenuAboutToHide();
+
   /**
    * @brief Slot for zooming in
    *