Add "Save a copy" to File menu.

include/patch.hpp

@@ -33,7 +33,7 @@ struct Manager {
 	/** Saves the patch and nothing else. */
 	void save(std::string path);
 	void saveDialog();
-	void saveAsDialog();
+	void saveAsDialog(bool setPath = true);
 	void saveTemplateDialog();
 	void saveAutosave();
 	void cleanAutosave();

src/app/MenuBar.cpp

@@ -97,6 +97,10 @@ struct FileButton : MenuButton {
 			APP->patch->saveAsDialog();
 		}));
 
+		menu->addChild(createMenuItem("Save a copy", "", []() {
+			APP->patch->saveAsDialog(false);
+		}));
+
 		menu->addChild(createMenuItem("Save template", "", []() {
 			APP->patch->saveTemplateDialog();
 		}));

src/patch.cpp

@@ -126,7 +126,7 @@ void Manager::saveDialog() {
 }
 
 
-void Manager::saveAsDialog() {
+void Manager::saveAsDialog(bool setPath) {
 	std::string dir;
 	std::string filename;
 	if (this->path == "") {
@@ -156,7 +156,9 @@ void Manager::saveAsDialog() {
 	}
 
 	APP->history->setSaved();
-	this->path = path;
+	if (setPath) {
+		this->path = path;
+	}
 
 	try {
 		save(path);