Do not space symbols in limits

oscargus · oscargus · commit d52726a33420 · 2023-07-13T04:15:21.000+02:00
diff --git a/doc/sphinxext/math_symbol_table.py b/doc/sphinxext/math_symbol_table.py
@@ -83,7 +83,7 @@ def render_symbol(sym, ignore_variant=False):
             if sym not in (_mathtext.Parser._overunder_functions |
                            _mathtext.Parser._function_names):
                 sym = chr(_mathtext_data.tex2uni[sym])
-        return f'\\{sym}' if sym in ('\\', '|') else sym
+        return f'\\{sym}' if sym in ('\\', '|', '+', '-', '*') else sym
 
     lines = []
     for category, columns, syms in symbols:
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -2149,9 +2149,11 @@ def symbol(self, s, loc, toks):
             # such as ${ -2}$, $ -2$, or $   -2$.
             prev_char = next((c for c in s[:loc][::-1] if c != ' '), '')
             # Binary operators at start of string should not be spaced
-            if (c in self._binary_operators and
-                    (len(s[:loc].split()) == 0 or prev_char == '{' or
-                     prev_char in self._left_delims)):
+            # Also, operators in sub- or superscripts should not be spaced
+            if (self._in_subscript_or_superscript or (
+                    c in self._binary_operators and (
+                    len(s[:loc].split()) == 0 or prev_char == '{' or
+                    prev_char in self._left_delims))):
                 return [char]
             else:
                 return [Hlist([self._make_space(0.2),
