new feature: support for centered cursor (disabled by default)

doc/config

@@ -225,6 +225,8 @@
 #
 #autocenter_mode = "no"
 #
+#centered_cursor = "no"
+#
 #progressbar_look = "=>"
 #
 #default_place_to_search_in = "database" (database/playlist)

doc/ncmpcpp.1

@@ -180,6 +180,9 @@ If enabled, statusbar will be displayed, otherwise hidden.
 .B autocenter_mode = yes/no
 Default state for autocenter mode at start.
 .TP 
+.B centered_cursor = yes/no
+If enabled, currently highlighted position in the list will be always centered.
+.TP 
 .B progressbar_look = TEXT
 This variable defines the look of progressbar. Note that it has to be exactly two characters long.
 .TP 

src/screen.h

@@ -235,6 +235,8 @@ template <typename WindowType> void Screen<WindowType>::Scroll(Where where, cons
 	}
 	else
 		w->Scroll(where);
+	if (List *list = Config.centered_cursor ? dynamic_cast<List *>(w) : 0)
+		list->Highlight(list->Choice());
 }
 
 template <typename WindowType> void Screen<WindowType>::MouseButtonPressed(MEVENT me)

src/settings.cpp

@@ -293,6 +293,7 @@ void DefaultConfiguration(ncmpcpp_config &conf)
 	conf.header_visibility = true;
 	conf.header_text_scrolling = true;
 	conf.statusbar_visibility = true;
+	conf.centered_cursor = false;
 	conf.autocenter_mode = false;
 	conf.wrapped_search = true;
 	conf.space_selects = false;
@@ -756,6 +757,10 @@ void ReadConfiguration(ncmpcpp_config &conf)
 			{
 				conf.autocenter_mode = v == "yes";
 			}
+			else if (cl.find("centered_cursor") != std::string::npos)
+			{
+				conf.centered_cursor = v == "yes";
+			}
 			else if (cl.find("default_find_mode") != std::string::npos)
 			{
 				conf.wrapped_search = v == "wrapped";

src/settings.h

@@ -186,6 +186,7 @@ struct ncmpcpp_config
 	bool header_visibility;
 	bool header_text_scrolling;
 	bool statusbar_visibility;
+	bool centered_cursor;
 	bool autocenter_mode;
 	bool wrapped_search;
 	bool space_selects;