add config option to disable text scrolling in header window

doc/config

@@ -147,6 +147,8 @@
 #
 #statusbar_visibility = "yes"
 #
+#header_text_scrolling = "yes"
+#
 #fancy_scrolling = "yes"
 #
 #cyclic_scrolling = "no"

doc/ncmpcpp.1

@@ -120,6 +120,9 @@ One of colors used in Song info, Tiny tag editor and Search engine.
 .B colors_enabled = yes/no
 No need to describe it, huh?
 .TP 
+.B header_text_scrolling = yes/no
+If enabled, text in header window will scroll if its length is longer then actual screen width, otherwise it won't.
+.TP 
 .B fancy_scrolling = yes/no
 If enabled, content of other columns will be updated immediately while scrolling, otherwise only after you stop scrolling.
 .TP 

src/helpers.cpp

@@ -333,6 +333,8 @@ const std::basic_string<my_char_t> &Scroller(const string &str, size_t width, si
 	static std::basic_string<my_char_t> result;
 	result.clear();
 	std::basic_string<my_char_t> s = TO_WSTRING(str);
+	if (!Config.header_text_scrolling)
+		return (result = s);
 	size_t len;
 #	ifdef _UTF8
 	len = Window::Length(s);

src/settings.cpp

@@ -263,6 +263,7 @@ void DefaultConfiguration(ncmpcpp_config &conf)
 	conf.columns_in_browser = false;
 	conf.columns_in_search_engine = false;
 	conf.header_visibility = true;
+	conf.header_text_scrolling = true;
 	conf.statusbar_visibility = true;
 	conf.autocenter_mode = false;
 	conf.wrapped_search = true;
@@ -616,6 +617,10 @@ void ReadConfiguration(ncmpcpp_config &conf)
 			{
 				conf.header_visibility = v == "yes";
 			}
+			else if (cl.find("header_text_scrolling") != string::npos)
+			{
+				conf.header_text_scrolling = v == "yes";
+			}
 			else if (cl.find("statusbar_visibility") != string::npos)
 			{
 				conf.statusbar_visibility = v == "yes";

src/settings.h

@@ -154,6 +154,7 @@ struct ncmpcpp_config
 	bool columns_in_search_engine;
 	bool set_window_title;
 	bool header_visibility;
+	bool header_text_scrolling;
 	bool statusbar_visibility;
 	bool autocenter_mode;
 	bool wrapped_search;