[issue37706] IDLE: fix sidebar click-drag bug and macOS test failures

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

All I can add is these are the steps: https://github.com/python/cpython/blob/master/.azure-pipelines/macos-steps.yml

The Linux steps use xvfb, but the macOS steps do not. And we don't do anything at all to install Tcl/Tk on the build agent.

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