From cfded00f13775d5bbeff8f53f09e8d02487f73bc Mon Sep 17 00:00:00 2001
From: YishiMichael <50232075+YishiMichael@users.noreply.github.com>
Date: Fri, 20 May 2022 18:56:40 +0800
Subject: [PATCH] Fix a logistic bug (#1815)

---
 manimlib/mobject/svg/string_mobject.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/manimlib/mobject/svg/string_mobject.py b/manimlib/mobject/svg/string_mobject.py
index 5004960e..e4376a33 100644
--- a/manimlib/mobject/svg/string_mobject.py
+++ b/manimlib/mobject/svg/string_mobject.py
@@ -174,8 +174,8 @@ class StringMobject(SVGMobject, ABC):
             ):
                 l = self.full_span[1]
                 span = tuple(
+                    default_index if index is None else
                     min(index, l) if index >= 0 else max(index + l, 0)
-                    if index is not None else default_index
                     for index, default_index in zip(sel, self.full_span)
                 )
                 return [span]