[Firefox] Unable to navigate with arrow keys inside table

[f1ames]

Is this a bug report or feature request? (choose one)

🐞 Bug report

💻 Version of CKEditor

Latest master and v11.1.1

📋 Steps to reproduce

1. Go to https://ckeditor.com/docs/ckeditor5/latest/examples/builds/document-editor.html.
2. Focus table inside editor.
3. Try to navigate with arrow keys between table cells.

✅ Expected result

It is possible to navigate with arrow keys between cells.

❎ Actual result

Nothing happens.

📃 Other details that might be useful

Tested with Firefox 65.0.1 (64-bit) on macOS 10.13.6 (17G65).

It works fine on Chrome. From what I have found in the https://github.com/ckeditor/ckeditor5-table/issues/108#issuecomment-419114747 this behaviour is left for the browser to handle so I'm not sure if it worked in Firefox earlier (doesn't work with v11.1.1). It works fine when table is placed inside contenteditable (tested without CKEditor).

[jodator]

@f1ames That worked on Firefox some time ago - at least when the plugin was created. There was even mismatch in that behavior between browsers. In Firefox you could use arrow up/down to go to previous/next row. On Chrome you'd go to previous/next cell hence the #3227 issue was created.

ps.: I liked the FF implementation more.

[jodator]

I've checked the:

• https://ckeditor.com/docs/ckeditor5/11.0.1/examples/builds/document-editor.html
• https://ckeditor.com/docs/ckeditor5/11.1.0/examples/builds/document-editor.html

Both are not working so I guess something happened to the FF.

[f1ames]

I have checked with Firefox 59, 62, 63 (on Browserstack) with 11.1.1 and 11.0.1 and it doesn't work there either.

[Reinmar]

I don't think this ever worked. There were differences between browsers from the very beginning and I think it was one of them.

In any case, let's keep all those navigation issues in one place. Merging to https://github.com/ckeditor/ckeditor5-table/issues/108