[issue14936] PEP 3121, 384 refactoring applied to curses_panel module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This patch made the "_curses_panel.curses panel" type callable. Created objects were in inconsistent state and using them caused a crash.

This bug is fixed in issue23815. Opened issue26979 for documenting the catch.

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nosy: +serhiy.storchaka

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