FX autoquit disabled by default (#4378)

Really short notes doesn't work well with delay based effects with the default
decay settings of the FX autoquit system where the effect can cut out. Set
autoquit as disabled by default.
Decay and Gate knobs are now also disabled when autoquit is disabled.

src/gui/SetupDialog.cpp

@@ -135,7 +135,7 @@ SetupDialog::SetupDialog( ConfigTabs _tab_to_open ) :
 	m_displayWaveform(ConfigManager::inst()->value( "ui",
 						   "displaywaveform").toInt() ),
 	m_disableAutoQuit(ConfigManager::inst()->value( "ui",
-						   "disableautoquit").toInt() ),
+						   "disableautoquit", "1" ).toInt() ),
 	m_vstEmbedMethod( ConfigManager::inst()->vstEmbedMethod() )
 {
 	setWindowIcon( embed::getIconPixmap( "setup_general" ) );

src/gui/widgets/EffectView.cpp

@@ -75,7 +75,7 @@ EffectView::EffectView( Effect * _model, QWidget * _parent ) :
 	m_autoQuit = new TempoSyncKnob( knobBright_26, this );
 	m_autoQuit->setLabel( tr( "DECAY" ) );
 	m_autoQuit->move( 60, 5 );
-	m_autoQuit->setEnabled( isEnabled );
+	m_autoQuit->setEnabled( isEnabled && !effect()->m_autoQuitDisabled );
 	m_autoQuit->setHintText( tr( "Time:" ), "ms" );
 	m_autoQuit->setWhatsThis( tr(
 "The Decay knob controls how many buffers of silence must pass before the "
@@ -86,7 +86,7 @@ EffectView::EffectView( Effect * _model, QWidget * _parent ) :
 	m_gate = new Knob( knobBright_26, this );
 	m_gate->setLabel( tr( "GATE" ) );
 	m_gate->move( 93, 5 );
-	m_gate->setEnabled( isEnabled );
+	m_gate->setEnabled( isEnabled && !effect()->m_autoQuitDisabled );
 	m_gate->setHintText( tr( "Gate:" ), "" );
 	m_gate->setWhatsThis( tr(
 "The Gate knob controls the signal level that is considered to be 'silence' "