stop using literal 500 as a window timeout

src/actions.cpp

@@ -2686,7 +2686,7 @@ void seek()
 	auto t = Timer;
 	
 	int old_timeout = wFooter->getTimeout();
-	wFooter->setTimeout(500);
+	wFooter->setTimeout(BaseScreen::defaultWindowTimeout);
 	
 	auto seekForward = &Actions::get(Actions::Type::SeekForward);
 	auto seekBackward = &Actions::get(Actions::Type::SeekBackward);

src/media_library.cpp

@@ -163,7 +163,7 @@ public:
 
 MediaLibrary::MediaLibrary()
 : m_timer(boost::posix_time::from_time_t(0))
-, m_window_timeout(Config.data_fetching_delay ? 250 : 500)
+, m_window_timeout(Config.data_fetching_delay ? 250 : BaseScreen::defaultWindowTimeout)
 , m_fetching_delay(boost::posix_time::milliseconds(Config.data_fetching_delay ? 250 : -1))
 {
 	hasTwoColumns = 0;

src/playlist_editor.cpp

@@ -62,7 +62,7 @@ bool SongEntryMatcher(const Regex::Regex &rx, const MPD::Song &s);
 
 PlaylistEditor::PlaylistEditor()
 : m_timer(boost::posix_time::from_time_t(0))
-, m_window_timeout(Config.data_fetching_delay ? 250 : 500)
+, m_window_timeout(Config.data_fetching_delay ? 250 : BaseScreen::defaultWindowTimeout)
 , m_fetching_delay(boost::posix_time::milliseconds(Config.data_fetching_delay ? 250 : -1))
 {
 	LeftColumnWidth = COLS/3-1;

src/screen.h

@@ -101,6 +101,8 @@ struct BaseScreen
 	/// Unlocks a screen, ie. hides merged window (if there is one set).
 	static void unlock();
 	
+	const static int defaultWindowTimeout = 500;
+
 protected:
 	/// Gets X offset and width of current screen to be used eg. in resize() function.
 	/// @param adjust_locked_screen indicates whether this function should
@@ -187,9 +189,9 @@ public:
 	}
 	
 	/// @return timeout parameter used for the screen (in ms)
-	/// @default 500
+	/// @default defaultWindowTimeout
 	virtual int windowTimeout() OVERRIDE {
-		return 500;
+		return defaultWindowTimeout;
 	}
 
 	/// Invoked after there was one of mouse buttons pressed