use key (F)4 to reset search engine state while being in this screen

src/help.cpp

@@ -254,6 +254,7 @@ void Help::GetKeybindings()
 	*w << DisplayKeys(Key.EditTags)			<< "Edit song's tags\n";
 #	endif // HAVE_TAGLIB_H
 	*w << DisplayKeys(Key.ToggleSingle)		<< "Start searching immediately\n";
+	*w << DisplayKeys(Key.SearchEngine)		<< "Reset search engine\n";
 	
 	
 	*w << "\n\n   " << fmtBold << "Keys - Media library\n -----------------------------------------\n" << fmtBoldEnd;

src/search_engine.cpp

@@ -84,7 +84,10 @@ void SearchEngine::SwitchTo()
 	using Global::myScreen;
 	
 	if (myScreen == this)
+	{
+		Reset();
 		return;
+	}
 	
 	if (!isInitialized)
 		Init();
@@ -169,11 +172,7 @@ void SearchEngine::EnterPressed()
 	}
 	else if (option == ResetButton)
 	{
-		for (size_t i = 0; i < ConstraintsNumber; ++i)
+		Reset();
-			itsConstraints[i].clear();
-		w->Reset();
-		Prepare();
-		ShowMessage("Search state reset");
 	}
 	else
 		w->Bold(w->Choice(), myPlaylist->Add(*w->Current().second, w->isBold(), 1));
@@ -301,6 +300,15 @@ void SearchEngine::Prepare()
 	*w->at(ResetButton).first << "Reset";
 }
 
+void SearchEngine::Reset()
+{
+	for (size_t i = 0; i < ConstraintsNumber; ++i)
+		itsConstraints[i].clear();
+	w->Reset();
+	Prepare();
+	ShowMessage("Search state reset");
+}
+
 void SearchEngine::Search()
 {
 	bool constraints_empty = 1;

src/search_engine.h

@@ -59,6 +59,7 @@ class SearchEngine : public Screen< Menu< std::pair<Buffer *, MPD::Song *> > >
 	private:
 		void Prepare();
 		void Search();
+		void Reset();
 		
 		const char **SearchMode;