latest finetuning for cm, other fonts will need different parameters!

zblz · zblz · commit 8007cd19deab · 2015-08-07T01:32:25.000+01:00
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -1187,7 +1187,7 @@ def get_underline_thickness(self, font, fontsize, dpi):
 # get any smaller
 NUM_SIZE_LEVELS = 6
 # Percentage of x-height of additional horiz. space after sub/superscripts
-SCRIPT_SPACE    = 0.07
+SCRIPT_SPACE    = 0.00
 # Percentage of x-height that sub/superscripts drop below the baseline
 SUBDROP         = 0.3
 # Percentage of x-height that superscripts drop below the baseline
@@ -2685,7 +2685,10 @@ def subsuper(self, s, loc, toks):
                 "Subscript/superscript sequence is too long. "
                 "Use braces { } to remove ambiguity.")
 
-        last_char = nucleus.children[-2] if isinstance(nucleus,Hlist) else nucleus
+        last_char = nucleus
+        if isinstance(nucleus,Hlist):
+            if len(nucleus.children) >= 2:
+                last_char = nucleus.children[-2]
 
         state = self.get_state()
         rule_thickness = state.font_output.get_underline_thickness(
