bpo-1207613: Add scrollbar to IDLE editor

[justsomenewgui]

Create AutoHideScrollbar in editor.py

https://bugs.python.org/issue1207613

[the-knights-who-say-ni]

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[Mariatta]

I think this needs a ticket in bugs.python.org.
You should also create your branch off the main branch instead of the 3.9 branch.
And finally, you'll need to write tests.

[terryjreedy]

Please read the relevant sections of the developers' guide https://devguide.python.org/.

I will not look at this until you are recorded as having signed the CLA. But see below.

Nearly all PRs, including this one, must be against the main branch. You will probably have to close this. But do CLA first and see below.

Addition's like this need an issue. If this is about adding a horizontal scrollbar, there already is one: bpo-1207613. There is also a patch: #1984. It was not merged because there were issues with the autohide behavior. See both the issue and PR.

We are supposedly switching to github issues this weekend. I don't know how that will affect the CLA and review processes.

[Mariatta]

The GitHub Issues migration has been postponed to April 1st. Source: https://discuss.python.org/t/github-issues-migration-status-update/14573

[terryjreedy]

Closing because no CLA and because a quick glance shows this to be a duplicate of a subset of the existing patch #1984.