[issue4630] IDLE: add cursor noblink option

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

My intent is that a followup patch should, for font sample and entry widgets, set insertofftime=0 on creation if not cursor_blink.  A new idleConf.set_cursor_blink(widget), something like the new EditorWindow.update_cursor_blink could be used multiple places.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue4630>
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