Focus becomes trapped within iframe in GridListItem

[LFDanLu]

Discussed in #4760

^{Originally posted by AlexGalays July 12, 2023}
It doesn't seem possible as this hook uses getFocusableTreeWalker internally, which has a hardcoded list of focusable elements to cycle.

My use case: In my grid row cell, there is an iframe for read only but important purposes, so it can not be hidden. I want to skip it entirely and just go to the next item. Also currently, once the iframe has focus, it then eats all subsequent left/right arrow keyboard events, ending the navigation.

Being able to pass some accept(node: Element) => boolean function like in FocusManager might be nice?

[LFDanLu]

To the team: we may want to revisit what elements should be considered focusable when using the left/right arrows to navigate through a GridListItem or a GridCell.