Issue #14962: Update text coloring in IDLE shell window after changing
options.  Patch by Roger Serwy.
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index edb4f37..278f4f6 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -309,6 +309,11 @@
             "console": idleConf.GetHighlight(theme, "console"),
         })
 
+    def removecolors(self):
+        # Don't remove shell color tags before "iomark"
+        for tag in self.tagdefs:
+            self.tag_remove(tag, "iomark", "end")
+
 class ModifiedUndoDelegator(UndoDelegator):
     "Extend base class: forbid insert/delete before the I/O mark"