Allow nick foreground style to have further attributes

Previously, Urwid crashed when the foreground style with further
attributes was used as background color in the focus map.

twtxtrenderer.py

@@ -68,6 +68,7 @@ nick_colors = {
     "lysetest": ("light magenta", "light green"),
     "lysetestneu": ("light green", "light magenta"),
     "xuu": "brown",
+    "lyse": "light green,bold",
 }
 
 palette = [
@@ -99,8 +100,9 @@ for nick, color in nick_colors.items():
         fg, bg = color
     else:
         fg, bg = color, "black"
+    fg_color, _, fg_attr = fg.partition(",")
     palette.extend([("nick-%s-normal" % nick, fg, bg),
-                    ("nick-%s-focus" % nick, bg, fg)])
+                    ("nick-%s-focus" % nick, bg + (("," + fg_attr) if fg_attr else ""), fg_color)])
     unread_focus_map["nick-%s-normal" % nick] = "nick-%s-focus" % nick
 read_normal_map = {None: "read-normal"}
 read_focus_map = dict(item for item in unread_focus_map.items())