Inserting can cause weird highlighting
If you insert instead of copy paste a large snippet of code it is likely to highlight weirdly. Reproducible code:
from tkinter import Tk
from chlorophyll import CodeView
root = Tk()
text = CodeView(root, wrap="none")
text.pack()
text.insert("1.0", """
from tkinter import Tk
from chlorophyll import CodeView
root = Tk()
text = CodeView(root, wrap="none")
text.pack()
text.insert("1.0", "Hello world")
root.mainloop()
""")
root.mainloop()