Fix a bug in multiline colored text

if the first, attribute color was negative, the color wasn’t passed on
to the next line.

poezio/windows/funcs.py

@@ -3,6 +3,7 @@ Standalone functions used by the modules
 """
 
 import string
+DIGITS = string.digits + '-'
 
 from poezio.windows.base_wins import FORMAT_CHAR, format_chars
 
@@ -42,7 +43,7 @@ def parse_attrs(text, previous=None):
             attrs.append('u')
         elif attr_char == 'b':
             attrs.append('b')
-        if attr_char in string.digits and attr_char:
+        if attr_char in DIGITS and attr_char:
             color_str = text[next_attr_char+1:text.find('}', next_attr_char)]
             if color_str:
                 attrs.append(color_str + '}')