[issue4630] IDLE: add cursor noblink option

[Terry J. Reedy]

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

Zackary's patch toggles blinking immediately in editor/shell/output windows, but does not affect the FontSample and numerous dialog entry lines.  I changed the patch to store 'insertofftime' just once, as idleConf.blink_off_time.  This is set the first time a shell or editor is created.

This can be used in a future patch to set the option when other cursor widgets are created. (Trying to update all visible or hidden entry lines is too much work.)  For dialogs created just once, this will be the next time IDLE is started.  Having these blink for the remainder of a session, if used again, should be a minor nuisance compared to blinking in the shell and editors.

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<https://bugs.python.org/issue4630>
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