Card preview on style panel is refreshed when styling changes

src/gui/control/card_viewer.cpp

@@ -38,6 +38,10 @@ void CardViewer::redraw(const ValueViewer& v) {
 }
 
 void CardViewer::onChange() {
+	redraw();
+}
+
+void CardViewer::redraw() {
 	if (drawing) return;
 	up_to_date = false;
 	Refresh(false);

src/gui/control/card_viewer.hpp

@@ -30,6 +30,8 @@ class CardViewer : public wxControl, public DataViewer {
 	/** May NOT be called while in onPaint/draw */
 	shared_ptr<DC> overdrawDC();
 	
+	/// Invalidate and redraw the entire viewer
+	void redraw();
 	/// Invalidate and redraw (the area of) a single value viewer
 	virtual void redraw(const ValueViewer&);
 	

src/gui/set/style_panel.cpp

@@ -16,6 +16,9 @@
 #include <data/card.hpp>
 #include <data/stylesheet.hpp>
 #include <data/action/set.hpp>
+#include <data/action/value.hpp>
+
+DECLARE_TYPEOF_COLLECTION(FieldP);
 
 // ----------------------------------------------------------------------------- : StylePanel
 
@@ -68,6 +71,17 @@ void StylePanel::onAction(const Action& action, bool undone) {
 			editor->showCard(card);
 		}
 	}
+	TYPE_CASE(action, ValueAction) {
+		// is it a styling action?
+		const StyleSheet& s = set->stylesheetFor(card);
+		FOR_EACH_CONST(f, s.styling_fields) {
+			if (action.valueP->fieldP == f) {
+				// refresh the viewer
+				preview->redraw();
+				return;
+			}
+		}
+	}
 	use_for_all->Enable(card && card->stylesheet);
 	use_custom_options->Enable(card);
 	use_custom_options->SetValue(card->has_styling);