Inline macro content parameter should always be editable

• Edit Sandbox Page
• Select some text, not a whole paragraph, and insert an Information Macro
• The selected text gets prefilled into the content parameter
• The user then decides to make changes to the content, but the Content Parameter is not available in the dialog

Expected behavior: the user may edit the content before inserting the macro
Actual behavior: The user has to submit the macro, then edit the macro egain to gain access to the content, since the Macro is not inline editable in CKEditor, then re-submit.

This is not plausible for the user. See attached gif.

Suggestion: the Macro dialog shall always display the Content parameter, as it was bevor the "Macro Content Prefill" feature existed.

See also CKEDITOR-246