Add RackWidget::clearCablesAction

include/app/RackWidget.hpp

@@ -53,6 +53,7 @@ struct RackWidget : OpaqueWidget {
 	// Cable methods
 
 	void clearCables();
+	void clearCablesAction();
 	/** Removes all complete cables connected to the port */
 	void clearCablesOnPort(PortWidget *port);
 	/** Adds a complete cable and adds it to the Engine.

src/app/RackWidget.cpp

@@ -408,6 +408,26 @@ void RackWidget::clearCables() {
 	cableContainer->clearChildren();
 }
 
+void RackWidget::clearCablesAction() {
+	// Add CableRemove for every cable to a ComplexAction
+	history::ComplexAction *complexAction = new history::ComplexAction;
+
+	for (Widget *w : cableContainer->children) {
+		CableWidget *cw = dynamic_cast<CableWidget*>(w);
+		assert(cw);
+		if (cw == incompleteCable)
+			continue;
+
+		// history::CableRemove
+		history::CableRemove *h = new history::CableRemove;
+		h->setCable(cw);
+		complexAction->push(h);
+	}
+
+	app()->history->push(complexAction);
+	clearCables();
+}
+
 void RackWidget::clearCablesOnPort(PortWidget *port) {
 	assert(port);
 	std::list<Widget*> childrenCopy = cableContainer->children;

src/patch.cpp

@@ -4,6 +4,7 @@
 #include "app.hpp"
 #include "app/Scene.hpp"
 #include "app/RackWidget.hpp"
+#include "history.hpp"
 #include "osdialog.h"
 
 
@@ -14,6 +15,7 @@ static const std::string PATCH_FILTERS = "VCV Rack patch (.vcv):vcv";
 
 
 void PatchManager::reset() {
+	app()->history->clear();
 	app()->scene->rackWidget->clear();
 	app()->scene->scrollWidget->offset = math::Vec(0, 0);
 	// Fails silently if file does not exist
@@ -122,6 +124,7 @@ void PatchManager::load(std::string path) {
 		json_decref(rootJ);
 	});
 
+	app()->history->clear();
 	app()->scene->rackWidget->clear();
 	app()->scene->scrollWidget->offset = math::Vec(0, 0);
 	fromJson(rootJ);
@@ -167,7 +170,7 @@ void PatchManager::disconnectDialog() {
 	if (!osdialog_message(OSDIALOG_WARNING, OSDIALOG_OK_CANCEL, "Remove all patch cables?"))
 		return;
 
-	app()->scene->rackWidget->clear();
+	app()->scene->rackWidget->clearCablesAction();
 }
 
 json_t *PatchManager::toJson() {