Tooltips for collapse/expand code blocks are missing

[LidiyaGeorgieva]

Describe the bug

Ace editor don't have tooltips for expand and collapse buttons in the editor field, which is not conform to this Accessibility requirement:
All semantic non-text content (e.g. graphics, videos) has to have a text alternative.
Accessibility specification: https://www.w3.org/WAI/WCAG21/Understanding/non-text-content.html

Expected Behavior

Buttons for expanding and collapsing code blocks to have tooltips.

Current Behavior

They don't have tooltips.

Reproduction Steps

Open https://ace.c9.io/ and hover over the buttons

Possible Solution

No response

Additional Information/Context

No response

Ace Version / Browser / OS / Keyboard layout

Latest version

[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.