[Idle] Indent width bug after adding custom keyset

[MaslowsAngels]

Bug report

Bug description:

Indent width bug in idle after changing "dedent-region" to "Shift+Tab"

Only tested on Windows with
Python 3.12.6 with tcl/tk 8.6.13

Deleted .idlerc and replicated bug again to confirm.

Steps to replicate:

1. Delete .idlerc
2. Launch Idle IDE
3. Custom keyset > change "dedent-region" to "Shift+Tab"
4. Close & relaunch Idle IDE

Tab indent defaults to 8 spaces ( remains 4 in GUI)
Have to reconfigure with Alt+U every time you launch Idle.

Annoying enough to be a bug even if it is intended behavior.

CPython versions tested on:

3.12

Operating systems tested on:

Windows

[MaslowsAngels]

I realize this is may be in the range of intended behavior, but I've been using tab for indenting for a long time and this has never been an issue, nor required any keyset changes.
Only since 3.12ish has one had to customize dedent region for Shift+Tab to work, AFAIK.

At the very least it's confusing and it's unclear how to permanently configure idle for tab / shift+tab coding

config-keys.cfg :
smart-indent = Key-Tab

It's not seeming very smart IMHO.