Tal Einat <talei...@gmail.com> added the comment:

Confirmed on latest master on OSX.

I'm also experiencing many other kinds of erratic scrolling behavior:
1. Dragging the scrollbar isn't possible immediately after opening the file 
Lib/idlelib/editor.py.  Also later after scrolling to the top.
2. Scrolling via two-finger swipte on the trackpad scrolls down both when I 
scroll up and down.
3. Clicking in the trough slightly below the slider has no effect.

There's definitely something very broken!

Commenting out the `return 'break'` in handle_yview() doesn't appear to affect 
this.

In all cases I ran idle from a terminal via `python -m idlelib` and saw no 
errors.

----------
versions: +Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34047>
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