[issue41000] IDLE only allow single instance

[Terry J. Reedy]

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

I am somewhat dubious about this.  IDLE *must* allow side-by-side windows.  AFAIK, single instance Notepad++ does not allow this.  Tiles rather than only tabbed windows can potentially be done with with one process (turtledemo), but we are not there yet.  I have no idea how easy it is to enforce 'one process' across platforms.

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versions:  -Python 3.7

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