Recognize more characters

test/shaping/hb-unicode-prettyname

@@ -9,6 +9,13 @@ shorthands = {
 	"ZERO WIDTH JOINER": "ZWJ",
 	"NARROW NO-BREAK SPACE": "NNBSP",
 	"COMBINING GRAPHEME JOINER": "CGJ",
+	"LEFT-TO-RIGHT MARK": "LRM",
+	"RIGHT-TO-LEFT MARK": "RLM",
+	"LEFT-TO-RIGHT EMBEDDING": "LRE",
+	"RIGHT-TO-LEFT EMBEDDING": "RLE",
+	"POP DIRECTIONAL FORMATTING": "PDF",
+	"LEFT-TO-RIGHT OVERRIDE": "LRO",
+	"RIGHT-TO-LEFT OVERRIDE": "RLO",
 }
 def pretty_name (x):
 	try: