From ed4a4621c616b416e96458fbf249671e67c9ccf6 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Sat, 11 Jun 2022 00:18:25 +0200
Subject: [PATCH] Fix spacing after mathtext operators with sub/superscripts

Picks up #22839.

Closes #22839, #17852.

Co-authored-by: henrybeUM <98666765+henrybeUM@users.noreply.github.com>
---
 lib/matplotlib/_mathtext.py                   |  21 +-
 .../test_mathtext/mathtext_cm_30.pdf          | Bin 8486 -> 0 bytes
 .../test_mathtext/mathtext_cm_30.png          | Bin 1712 -> 0 bytes
 .../test_mathtext/mathtext_cm_30.svg          | 188 ------------------
 .../test_mathtext/mathtext_dejavusans_30.pdf  | Bin 6180 -> 0 bytes
 .../test_mathtext/mathtext_dejavusans_30.png  | Bin 1520 -> 0 bytes
 .../test_mathtext/mathtext_dejavusans_30.svg  | 124 ------------
 .../test_mathtext/mathtext_dejavuserif_30.pdf | Bin 6377 -> 0 bytes
 .../test_mathtext/mathtext_dejavuserif_30.png | Bin 1374 -> 0 bytes
 .../test_mathtext/mathtext_dejavuserif_30.svg | 142 -------------
 .../test_mathtext/mathtext_stix_30.pdf        | Bin 4808 -> 0 bytes
 .../test_mathtext/mathtext_stix_30.png        | Bin 1365 -> 0 bytes
 .../test_mathtext/mathtext_stix_30.svg        | 155 ---------------
 .../test_mathtext/mathtext_stixsans_30.pdf    | Bin 4882 -> 0 bytes
 .../test_mathtext/mathtext_stixsans_30.png    | Bin 1374 -> 0 bytes
 .../test_mathtext/mathtext_stixsans_30.svg    | 157 ---------------
 lib/matplotlib/tests/test_mathtext.py         |   4 +-
 17 files changed, 23 insertions(+), 768 deletions(-)
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_30.pdf
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_30.png
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_30.svg
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_30.pdf
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_30.png
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_30.svg
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_30.pdf
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_30.png
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_30.svg
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_30.pdf
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_30.png
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_30.svg
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_30.pdf
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_30.png
 delete mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_30.svg

diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
index 927a315da8ae..3f9545349c98 100644
--- a/lib/matplotlib/_mathtext.py
+++ b/lib/matplotlib/_mathtext.py
@@ -1947,6 +1947,9 @@ def __init__(self):
         self._expression = p.main
         self._math_expression = p.math
 
+        # To add space to nucleus operators after sub/superscripts
+        self._in_subscript_or_superscript = False
+
     def parse(self, s, fonts_object, fontsize, dpi):
         """
         Parse expression *s* using the given *fonts_object* for
@@ -1965,6 +1968,8 @@ def parse(self, s, fonts_object, fontsize, dpi):
                                         " " * (err.column - 1) + "^",
                                         str(err)])) from err
         self._state_stack = None
+        self._in_subscript_or_superscript = False
+        # prevent operator spacing from leaking into a new expression
         self._em_width_cache = {}
         self._expression.resetCache()
         return result[0]
@@ -2164,6 +2169,13 @@ def operatorname(self, s, loc, toks):
             # Add thin space except when followed by parenthesis, bracket, etc.
             hlist_list += [self._make_space(self._space_widths[r'\,'])]
         self.pop_state()
+        # if followed by a super/subscript, set flag to true
+        # This flag tells subsuper to add space after this operator
+        if next_char in {'^', '_'}:
+            self._in_subscript_or_superscript = True
+        else:
+            self._in_subscript_or_superscript = False
+
         return Hlist(hlist_list)
 
     def start_group(self, s, loc, toks):
@@ -2394,8 +2406,15 @@ def subsuper(self, s, loc, toks):
 
         if not self.is_dropsub(last_char):
             x.width += constants.script_space * xHeight
-        result = Hlist([nucleus, x])
 
+        # Do we need to add a space after the nucleus?
+        # To find out, check the flag set by operatorname
+        spaced_nucleus = [nucleus, x]
+        if self._in_subscript_or_superscript:
+            spaced_nucleus += [self._make_space(self._space_widths[r'\,'])]
+            self._in_subscript_or_superscript = False
+
+        result = Hlist(spaced_nucleus)
         return [result]
 
     def _genfrac(self, ldelim, rdelim, rule, style, num, den):
diff --git a/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_30.pdf b/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_30.pdf
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deleted file mode 100644
index 7bc674a36430..000000000000
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diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
index 9f196a29216f..0d34966e200e 100644
--- a/lib/matplotlib/tests/test_mathtext.py
+++ b/lib/matplotlib/tests/test_mathtext.py
@@ -47,7 +47,7 @@
     r"$\arccos((x^i))$",
     r"$\gamma = \frac{x=\frac{6}{8}}{y} \delta$",
     r'$\limsup_{x\to\infty}$',
-    r'$\oint^\infty_0$',
+    None,
     r"$f'\quad f'''(x)\quad ''/\mathrm{yr}$",
     r'$\frac{x_2888}{y}$',
     r"$\sqrt[3]{\frac{X_2}{Y}}=5$",
@@ -333,6 +333,7 @@ def test_operator_space(fig_test, fig_ref):
     fig_test.text(0.1, 0.6, r"$\operatorname{op}[6]$")
     fig_test.text(0.1, 0.7, r"$\cos^2$")
     fig_test.text(0.1, 0.8, r"$\log_2$")
+    fig_test.text(0.1, 0.9, r"$\sin^2 \cos$")  # GitHub issue #17852
 
     fig_ref.text(0.1, 0.1, r"$\mathrm{log\,}6$")
     fig_ref.text(0.1, 0.2, r"$\mathrm{log}(6)$")
@@ -342,6 +343,7 @@ def test_operator_space(fig_test, fig_ref):
     fig_ref.text(0.1, 0.6, r"$\mathrm{op}[6]$")
     fig_ref.text(0.1, 0.7, r"$\mathrm{cos}^2$")
     fig_ref.text(0.1, 0.8, r"$\mathrm{log}_2$")
+    fig_ref.text(0.1, 0.9, r"$\mathrm{sin}^2 \mathrm{\,cos}$")
 
 
 def test_mathtext_fallback_valid():