tag editor: add modified_item_prefix to see modified items

doc/config

@@ -226,6 +226,8 @@
 #
 #selected_item_suffix = "$9"
 #
+#modified_item_prefix = "$2> $9"
+#
 ## colors are not supported for below variable
 #
 #song_window_title_format = "{%a - }{%t}|{%f}"

doc/ncmpcpp.1

@@ -159,6 +159,9 @@ Prefix for selected items.
 .B selected_item_suffix = TEXT
 Suffix for selected items.
 .TP 
+.B modified_item_prefix = TEXT
+Prefix for modified item (tag editor).
+.TP 
 .B alternative_header_first_line_format = TEXT
 Now playing song format for the first line in alternative user interface header window.
 .TP 

src/display.cpp

@@ -356,6 +356,8 @@ void Display::Songs(NC::Menu<MPD::Song> &menu, HasSongs *screen, const std::stri
 void Display::Tags(NC::Menu<MPD::MutableSong> &menu)
 {
 	const MPD::MutableSong &s = menu.drawn()->value();
+	if (s.isModified())
+		menu << Config.modified_item_prefix;
 	size_t i = myTagEditor->TagTypes->choice();
 	if (i < 11)
 	{

src/settings.cpp

@@ -180,6 +180,7 @@ void Configuration::SetDefaults()
 	selected_item_suffix << NC::clEnd;
 	now_playing_prefix << NC::fmtBold;
 	now_playing_suffix << NC::fmtBoldEnd;
+	modified_item_prefix << NC::clRed << "> " << NC::clEnd;
 	color1 = NC::clWhite;
 	color2 = NC::clGreen;
 	empty_tags_color = NC::clCyan;
@@ -575,6 +576,14 @@ void Configuration::Read()
 					now_playing_suffix_length = wideLength(now_playing_suffix.str());
 				}
 			}
+			else if (name == "modified_item_prefix")
+			{
+				if (!v.empty())
+				{
+					modified_item_prefix.clear();
+					String2Buffer(v, modified_item_prefix);
+				}
+			}
 			else if (name == "color1")
 			{
 				if (!v.empty())

src/settings.h

@@ -92,6 +92,7 @@ struct Configuration
 	NC::Buffer selected_item_suffix;
 	NC::Buffer now_playing_prefix;
 	NC::WBuffer now_playing_suffix;
+	NC::Buffer modified_item_prefix;
 	
 	NC::Color color1;
 	NC::Color color2;