📝 Provide detailed reproduction steps (if any)

1. Open https://ckeditor.com/docs/ckeditor5/latest/features/images/images-overview.html
2. Select any text and press Ctrl/Cmd + K to open link balloon toolbar.
3. Type any URL (e.g. https://ckeditor.com) and press Enter while the URL input is still focused. The link should be added
4. Open the Image dropdown and select the "Insert via URL" option.
5. Type any URL (e.g. https://placehold.co/200x300) and press Enter while the URL input is still focused.

✔️ Expected result

The image should be inserted into the editor – just like it happened with the link.

❌ Actual result

Nothing happens, the Enter keypress is ignored.

❓ Possible solution

The Enter key behavior from the Link balloon is connected with the implicit form submission behavior: if the text input in the form is focused when the user presses Enter, the form is submitted.

The input in the Link balloon is encapsulated inside a form and thanks to that, pressing Enter inserts the link. However, the input in the Image dialog is not encapsulated inside a form leading to a worse user experience (the user needs to either click the "Insert" button or – if they use only the keyboard for navigation – tab to the "Insert" button and press Enter/Space). Adding the form element to the Image dialog should fix the issue.

📃 Other details

• Browser: N/A (de facto all browsers support the implicit form submission)
• OS: N/A
• First affected CKEditor version: 42.0.0
• Installed CKEditor plugins: image

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