Qt: Add 'Apply' button to settings window (fixes #103)

CHANGES

@@ -20,6 +20,7 @@ Misc:
  - GBA Audio: Allow GBAAVStream to have no video callback
  - ARM7: Force disable LTO on two files to work around a GCC bug
  - Libretro: Use anonymous memory mappers for large blocks of memory
+ - Qt: Add 'Apply' button to settings window
 
 0.3.0: (2015-08-16)
 Features:

src/platform/qt/SettingsView.cpp

@@ -89,6 +89,11 @@ SettingsView::SettingsView(ConfigController* controller, QWidget* parent)
 
 	connect(m_ui.biosBrowse, SIGNAL(clicked()), this, SLOT(selectBios()));
 	connect(m_ui.buttonBox, SIGNAL(accepted()), this, SLOT(updateConfig()));
+	connect(m_ui.buttonBox, &QDialogButtonBox::clicked, [this](QAbstractButton* button) {
+		if (m_ui.buttonBox->buttonRole(button) == QDialogButtonBox::ApplyRole) {
+			updateConfig();
+		}
+	});
 }
 
 void SettingsView::selectBios() {

src/platform/qt/SettingsView.ui

@@ -549,7 +549,7 @@
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Apply|QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
      </property>
     </widget>
    </item>