4096 single line character limit on tkinter Text () widget?

Question

I ran into an interesting problem regarding a text widget in Tkinter. I don't seem to understand. Google also did not give any answers. It seems that Tkinter has a single line character limit for the Text () widget of 4096 characters when text wrapping is disabled. Is there a way to change this limit or make the text wrap after 4095 characters? I saw the "wraplength" option for other widgets, but nothing for the Text widget.

Code example:

import Tkinter as tk

if __name__ == "__main__":
    root = tk.Tk()
    text = tk.Text(root)
    sb = tk.Scrollbar(root, orient="horizontal", command=text.xview)
    text.configure(xscrollcommand=sb.set)
    text.configure(wrap=tk.NONE)
    text.pack(fill="both", expand=True)
    sb.pack(side="bottom", fill="x")

    text.insert("end","a"*4095)
    text.insert("end","\n")
    text.insert("end","b"*4096)
    text.insert("end","\n")
    text.insert("end","c"*4095)

    root.mainloop()

What is really strange if you press or highlight where the letters "b" should be printed, they appear suddenly? Why did they disappear in the first place?

Python Version: 2.7.5

OS: Windows 7

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Answer 1

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import Tkinter as tk

class WrapText(tk.Text):
    def __init__(self, master, wraplength=100, **kw):
        tk.Text.__init__(self, master, **kw)
        self.bind("<Any-Key>", self.check)
        self.wraplength = wraplength-1 

    def check(self, event=None):
        line, column = self.index(tk.INSERT).split('.')
        if event and event.keysym in ["BackSpace","Return"]: pass
        elif int(column) > self.wraplength: 
            self.insert("%s.%s" % (line,column),"\n")

    def wrap_insert(self, index, text):
        for char in text:
            self.check()
            self.insert(index, char)

if __name__ == "__main__":
    root = tk.Tk()
    text = WrapText(root, wraplength=4000)
    sb = tk.Scrollbar(root, orient="horizontal", command=text.xview)
    text.configure(xscrollcommand=sb.set)
    text.configure(wrap=tk.NONE)
    text.pack(fill="both", expand=True)
    sb.pack(side="bottom", fill="x")

##    text.tag_config("mystyle", background="yellow", foreground="red", wrap="char")

    text.wrap_insert("end","a"*4095)#,"mystyle")
    text.wrap_insert("end","\n")
    text.wrap_insert("end","b"*4095)
    text.wrap_insert("end","\n")
    text.wrap_insert("end","c"*4095)

    root.mainloop()

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