Make automation state buttons active when not on Manual

With the same color code as the fader automation button on mixer strips.
This is especially usefull when use_knob is true (e.g. for a-EQ) because
the automation only shows one letter and a "Write" state can thus be
easy to miss.

gtk2_ardour/generic_pluginui.cc

@@ -588,15 +588,17 @@ GenericPluginUI::automation_state_changed (ControlUI* cui)
 	// don't lock to avoid deadlock because we're triggered by
 	// AutomationControl::Changed() while the automation lock is taken
 
+	AutoState state = insert->get_parameter_automation_state (cui->parameter());
+
+	cui->automate_button.set_active((state != ARDOUR::Off));
+
 	if (cui->knobtable) {
 		cui->automate_button.set_text (
-				GainMeterBase::astate_string (
+				GainMeterBase::astate_string (state));
-					insert->get_parameter_automation_state (cui->parameter()))
-				);
 		return;
 	}
 
-	switch (insert->get_parameter_automation_state (cui->parameter()) & (ARDOUR::Off|Play|Touch|Write)) {
+	switch (state & (ARDOUR::Off|Play|Touch|Write)) {
 	case ARDOUR::Off:
 		cui->automate_button.set_text (S_("Automation|Manual"));
 		break;

gtk2_ardour/themes/blueberry-milk-ardour.colors

@@ -286,6 +286,7 @@
     <ColorAlias name="midi sysex fill" alias="color 32"/>
     <ColorAlias name="midi sysex outline" alias="color 64"/>
     <ColorAlias name="midi track base" alias="color 82"/>
+    <ColorAlias name="PluginAutomateButton: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: led active" alias="color 8"/>
     <ColorAlias name="mixer strip name button: fill active" alias="color 67"/>

gtk2_ardour/themes/caineville-ardour.colors

@@ -286,6 +286,7 @@
     <ColorAlias name="midi sysex fill" alias="color 32"/>
     <ColorAlias name="midi sysex outline" alias="color 64"/>
     <ColorAlias name="midi track base" alias="color 39"/>
+    <ColorAlias name="PluginAutomateButton: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: led active" alias="color 8"/>
     <ColorAlias name="mixer strip name button: fill active" alias="color 67"/>

gtk2_ardour/themes/clear-gray-ardour.colors

@@ -286,6 +286,7 @@
     <ColorAlias name="midi sysex fill" alias="color 10"/>
     <ColorAlias name="midi sysex outline" alias="color 64"/>
     <ColorAlias name="midi track base" alias="color 74"/>
+    <ColorAlias name="PluginAutomateButton: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: led active" alias="color 8"/>
     <ColorAlias name="mixer strip name button: fill active" alias="color 67"/>

gtk2_ardour/themes/cubasish-ardour.colors

@@ -286,6 +286,7 @@
     <ColorAlias name="midi sysex fill" alias="color 32"/>
     <ColorAlias name="midi sysex outline" alias="color 64"/>
     <ColorAlias name="midi track base" alias="color 39"/>
+    <ColorAlias name="PluginAutomateButton: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: led active" alias="color 8"/>
     <ColorAlias name="mixer strip name button: fill active" alias="color 67"/>

gtk2_ardour/themes/dark-ardour.colors

@@ -286,6 +286,7 @@
     <ColorAlias name="midi sysex fill" alias="color 32"/>
     <ColorAlias name="midi sysex outline" alias="color 64"/>
     <ColorAlias name="midi track base" alias="color 41"/>
+    <ColorAlias name="PluginAutomateButton: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: fill active" alias="color 8"/>
     <ColorAlias name="mixer strip button: led active" alias="color 8"/>
     <ColorAlias name="mixer strip name button: fill active" alias="color 67"/>

gtk2_ardour/themes/unastudia-ardour.colors

@@ -291,6 +291,7 @@
 		<ColorAlias name="midi sysex fill" alias="color 105"/>
 		<ColorAlias name="midi sysex outline" alias="color 17"/>
 		<ColorAlias name="midi track base" alias="color 27"/>
+		<ColorAlias name="PluginAutomateButton: fill active" alias="color 1"/>
 		<ColorAlias name="mixer strip button: fill active" alias="color 1"/>
 		<ColorAlias name="mixer strip button: led active" alias="color 1"/>
 		<ColorAlias name="mixer strip name button: fill active" alias="color 67"/>