Roger Serwy added the comment:
It's definitely a "bug" with Tk. Whenever the Text widget loses focus, the
selection highlighting goes away. The following example code brings up a
focused text box with selected text. Clicking the button switches focus to the
button itself and then back to the text widget. During that focus change, the
selection highlight goes away.
from tkinter import *
main = Tk()
text = Text(main, width=40, height=10, wrap="char")
text.pack()
text.insert(INSERT, "".join(map(str, range(100))))
text.tag_add(SEL, "1.0", "end")
text.focus_set()
def jump():
text.after(500, btn.focus_set)
text.after(1000, text.focus_set)
btn = Button(main, text="Click me", command=jump)
btn.pack()
main.mainloop()
One possible solution would be to use the "<FocusOut>" and "<FocusIn>" events
to substitute the "sel" tag with a custom tag so that the highlight remains
when losing focus, and then replace it with the "sel" tag when gaining focus.
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Python tracker <[email protected]>
<http://bugs.python.org/issue14146>
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