It's impossible to focus the toolbar with the keyboard in the source editing mode

[Mgsy]

📝 Provide a description of the improvement

1. Use the keyboard to enter the source editing mode.
2. Focus on the editable and type something.
3. Try to move back to the toolbar with the keyboard.

Related - #9906.

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[mlewand]

The poorman's solution would be simply to add alt+f10 handling for source editing plugin.

Now, the better idea would be to improve keystroke handler so that the keystrokes (hotkeys) could specify a context where a given keystroke is viable.

This way toolbar focus could be registered like:

editor.keystrokes.set( { keystroke: 'Ctrl+E', callback: ( data, cancel ) => {
    // logic goes here

}, context: "all" } );

And for instance keystrokes that make sense only in editable would be registered like that:

editor.keystrokes.set( { keystroke: 'Ctrl+E', command: 'bold', context: "editable" } );

Having that said let's go with poorman's solution as long as we don't have other cases that would benefit from contexts.

[wimleers]

Sounds good! 👍

FYI: tracking this at https://www.drupal.org/project/drupal/issues/3283800 😊