[issue31207] IDLE, configdialog: Factor out ExtPage class from ConfigDialog

Changes by Terry J. Reedy : -- dependencies: +IDLE: Add tests for configdialog extensions tab ___ Python tracker ___ ___ Python-bugs-l

[issue31207] IDLE, configdialog: Factor out ExtPage class from ConfigDialog

Changes by Terry J. Reedy : -- assignee: terry.reedy components: IDLE nosy: terry.reedy priority: normal severity: normal stage: test needed status: open title: IDLE, configdialog: Factor out ExtPage class from ConfigDialog versions: Python 3.6, Python 3.7 __