Feature request: multiline image caption

Current situation:

• Images pasted from the clipboard receive a default caption containing the filename. The caption text may be edited. The caption appears in the printed layout.
• The caption ist rendered as a HTML <input> field. Word-wrapping to a second line is not possible. Newlines are not possible either.

Feature Request: Multiline captions

• enable multiline captions

Alternatives:

• Manual alternative: Remove the text in the input tag and add a paragraph below the image.
  • There's no meta information that this is a caption
  • Margins between image and fake-caption my not be controlled
• Use a <textarea>Tag:
  • The <textarea> rendered height must be adapted on the fly while typing and before printing.
• Establish a text block type named «caption» in the brackets menu. Insert this text block containing the filename, instead of the <input> Tag. Allow the section to be deleted or converted to a normal paragraph (as always).

No source file, test, or entry point is identified in the issue. Start by locating the image-caption HTML input and the printed-layout handling, then compare the textarea and caption text-block alternatives. Done means captions support wrapping and newlines, resize while editing and before printing, and retain the intended caption behavior.