Support forums: expanded code still has scrollbar

[joyously]

The recent addition of the Expand/Contract button for forum topics' code sections does not appear to take into account the horizontal scrollbar for long lines.
This leaves the vertical scrollbar still there for 1 line's worth.
An example is on ​https://wordpress.org/support/topic/get-user-roles-in-function/
See attached for how it looks in Firefox.

A similar formatting is done in the Code Reference, but the vertical scrollbar is not shown, as it is outside the code container. An example is on ​https://developer.wordpress.org/reference/functions/media_handle_sideload/
See attached for how it looks in Firefox.

[joyously]

Firefox shows both scrollbars of expanded code in forum topic

[joyously]

Firefox shows horizontal scrollbar of expanded code in Code Reference

[vladytimy]

In our last bug scrub, we tested this and with the new block editor in place for Forums, this is no longer an issue. However, feel free to open if this issue persists with the new editor.