[ 1358130 ] Cannot get underscore in mathtext

Fixed.

svn path=/trunk/matplotlib/; revision=4238

Author: mdboom

examples/mathtext_examples.py

@@ -6,7 +6,7 @@
 
 stests = [
     r'Kerning: AVA $AVA$',
-    r'\$100.00 $\alpha$',
+    r'\$100.00 $\alpha \_$',
     r'$\frac{\$100.00}{y}$',
     r'$x   y$',
     r'$x+y\ x=y\ x<y\ x:y\ x,y\ x@y$',

lib/matplotlib/_mathtext_data.py

@@ -117,6 +117,7 @@
     r'%'                    : ('cmr10',   48),
     r'\$'                   : ('cmr10',   99),
     r'@'                    : ('cmr10',  111),
+    r'\_'                   : ('cmtt10', 79),
     r'\Gamma'               : ('cmr10',  19),
     r'\Delta'               : ('cmr10',   6),
     r'\Theta'               : ('cmr10',   7),
@@ -2236,6 +2237,7 @@
 '$': 36,
 '{': 123,
 '}': 125,
+'_': 95,
 'imath': 0x131,          
 'circumflexaccent'         : 770,
 'combiningbreve'           : 774,

lib/matplotlib/mathtext.py

@@ -1975,7 +1975,7 @@ def __init__(self):
                      ).setParseAction(self.customspace).setName('customspace')
 
         unicode_range = u"\U00000080-\U0001ffff"
-        symbol       =(Regex(UR"([a-zA-Z0-9 +\-*/<>=:,.;!'@()%s])|(\\[%%${}\[\]])" % unicode_range)
+        symbol       =(Regex(UR"([a-zA-Z0-9 +\-*/<>=:,.;!'@()%s])|(\\[%%${}\[\]_])" % unicode_range)
                      | Combine(
                          bslash
                        + oneOf(tex2uni.keys())