Include Undo and Redo options in the Legacy editor

Problem Definition

Although the Undo and Redo buttons have been implemented in the New editor (Fabric) via CONFCLOUD-58034, they are not available in the Legacy editor (TinyMCE).

Suggested Solution

Implement the Undo and Redo button in the Legacy Editor (TinyMCE).

Why this is important

Users migrated from Server and Data Center had those options with the On-Premises implementation of TinyMCE, so ideally the Legacy editor should mirror it as much as possible.

Workaround

A few options:

1. Migrate the Page to the New editor which has the Undo and Redo buttons;
2. Use keyboard shortcuts while using the Legacy editor.

Shortcuts: