Map new python "attribute" mapping to identifier_2, by default.

"attribute" is for highlighting object attributes or methods, i.e.
to style foo and bar differently in foo.bar.

Also set lexer properties to allow scintilla using different styles.

See ScintillaOrg/lexilla#49

data/filedefs/filetypes.python.in

@@ -21,6 +21,7 @@ fstring=string_1
 fcharacter=character
 ftriple=string_2
 ftripledouble=string_2
+attribute=identifier_1
 
 [keywords]
 # all items must be in one line
@@ -34,6 +35,8 @@ identifiers=ArithmeticError AssertionError AttributeError BaseException Blocking
 [lexer_properties]
 fold.quotes.python=1
 lexer.python.keywords2.no.sub.identifiers=1
+lexer.python.identifier.attributes=1
+lexer.python.identifier.decorator=1
 
 [settings]
 # default extension used when saving files

src/highlightingmappings.h

@@ -1349,7 +1349,8 @@ static const HLStyle highlighting_styles_PYTHON[] =
 	{ SCE_P_FCHARACTER,		"fcharacter",		FALSE },
 	{ SCE_P_FTRIPLE,		"ftriple",			FALSE },
 	{ SCE_P_FTRIPLEDOUBLE,	"ftripledouble",	FALSE },
-	{ SCE_P_DECORATOR,		"decorator",		FALSE }
+	{ SCE_P_DECORATOR,		"decorator",		FALSE },
+	{ SCE_P_ATTRIBUTE,		"attribute",		FALSE }
 };
 static const HLKeyword highlighting_keywords_PYTHON[] =
 {