(Gutter): (Accessbility)Expand collapse buttons not accessible via tab (Read only mode)

[thisisjasmeet]

Describe the bug

Expand collapse buttons are not accessible via keyboard navigation

Expected Behavior

user should be able to expand/collapse rows using keyboard actions.

Current Behavior

user is not able to focus on gutter icons using keyboard navigation

Reproduction Steps

1. Open editor in read only mode
2. press tab to to access gutter expand/collapse buttons
   Currently its not possible to do so

Possible Solution

No response

Additional Information/Context

No response

Ace Version / Browser / OS / Keyboard layout

"react-ace": "10.1.0"

[nightwing]

It is already possible to use the F2 key (the toggleFoldWidget) to collapse/expand the code

[akoreman]

This was added as part of PR #5146 and will be included in the next Ace release.

[akoreman]

Ace 1.20.0 has been released which includes this change.