fix string edge behaviour for comma and dot

matplotlib · mdboom · Jan 25, 2016 · Jan 19, 2016 · Jan 19, 2016 · Jan 19, 2016
commit 358cdeeb35d21b6e7e1c328e258951aee1e332bd
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -2658,11 +2658,12 @@ def symbol(self, s, loc, toks):

            # Do not space commas between brackets
            if c == ',':
+                prev_char, next_char = '', ''
                for i in six.moves.xrange(1, loc + 1):
                    prev_char = s[loc - i]
                    if prev_char != ' ':
                        break
-                for i in six.moves.xrange(1, loc + 1):
+                for i in six.moves.xrange(1, len(s) - loc):
                    next_char = s[loc + i]
                    if next_char != ' ':
                        break

diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -105,7 +105,7 @@
    ' '.join('$\\' + p + '$' for p in sorted(mathtext.Parser._snowflake)),
    r'$6-2$; $-2$; $ -2$; ${-2}$; ${  -2}$; $20^{+3}_{-2}$',
    r'$\overline{\omega}^x \frac{1}{2}_0^x$', # github issue #5444
-    r'$1{,}234{, }567{ , }890$ and $1,234,567,890$', # github issue 5799
+    r'$,$ $.$ $1{,}234{, }567{ , }890$ and $1,234,567,890$', # github issue 5799
 ]

 digits = "0123456789"