Add tm_parser_scope_separator_printable()

The added tm_parser_scope_separator_printable() function is a human
readable representation of scope separator. For most languages, this is
equal to the scope separator but for some (mostly markup languages),
some "strange" scope separators are used like \0x3 or \"\" and we need
something more readable when displayed to users. " > " seems to look
good.

This new function can be used to:
1. Format calltips (though real languages use human-readable scope sep)
2. Symbol tree filter and display.

src/symbols.c

@@ -338,7 +338,7 @@ static GList *get_tag_list(GeanyDocument *doc, TMTagType tag_types)
 			gboolean filtered = FALSE;
 			gchar **val;
 			gchar *full_tagname = g_strconcat(tag->scope ? tag->scope : "",
-				tag->scope ? tm_parser_scope_separator(tag->lang) : "",
+				tag->scope ? tm_parser_scope_separator_printable(tag->lang) : "",
 				tag->name, NULL);
 			gchar *normalized_tagname = g_utf8_normalize(full_tagname, -1, G_NORMALIZE_ALL);
 
@@ -960,7 +960,7 @@ static const gchar *get_symbol_name(GeanyDocument *doc, const TMTag *tag, gboole
 	if (!found_parent && scope &&
 		strpbrk(scope, GEANY_WORDCHARS) == scope)
 	{
-		const gchar *sep = tm_parser_scope_separator(tag->lang);
+		const gchar *sep = tm_parser_scope_separator_printable(tag->lang);
 
 		g_string_append(buffer, scope);
 		g_string_append(buffer, sep);

src/tagmanager/tm_parser.c

@@ -957,7 +957,7 @@ gchar *tm_parser_format_function(TMParserType lang, const gchar *fname, const gc
 	if (scope)
 	{
 		g_string_append(str, scope);
-		g_string_append(str, tm_parser_scope_separator(lang));
+		g_string_append(str, tm_parser_scope_separator_printable(lang));
 	}
 	g_string_append(str, fname);
 	g_string_append_c(str, ' ');
@@ -1030,6 +1030,22 @@ const gchar *tm_parser_scope_separator(TMParserType lang)
 }
 
 
+const gchar *tm_parser_scope_separator_printable(TMParserType lang)
+{
+	switch (lang)
+	{
+		case TM_PARSER_TXT2TAGS:
+		case TM_PARSER_ASCIIDOC:
+		case TM_PARSER_CONF:
+		case TM_PARSER_REST:
+			return " > ";
+
+		default:
+			return tm_parser_scope_separator(lang);
+	}
+}
+
+
 gboolean tm_parser_has_full_scope(TMParserType lang)
 {
 	switch (lang)

src/tagmanager/tm_parser.h

@@ -141,6 +141,8 @@ gchar *tm_parser_format_function(TMParserType lang, const gchar *fname, const gc
 
 const gchar *tm_parser_scope_separator(TMParserType lang);
 
+const gchar *tm_parser_scope_separator_printable(TMParserType lang);
+
 gboolean tm_parser_has_full_scope(TMParserType lang);
 
 gboolean tm_parser_langs_compatible(TMParserType lang, TMParserType other);