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The form-feed character #x0C can be displayed as horizontal line with the packages form-feed and page-break-lines. Pityingly it would cause double-line spacing if this technique was used for newlines. Maybe the lines can be squeezed a bit.
Not to rain on your parade, but if it does turn out to be a feature request, it's likely to be low priority since it would be a purely visual rather than functional feature.
It should already be feasible on elisp level. One could pad the visible part of the buffer with spaces (maybe with the after-string text property) and use some underlined face.
default
face, but I'm afraid all of your Emacs will look quite ugly.M-x customize-face
#x0C
can be displayed as horizontal line with the packagesform-feed
andpage-break-lines
. Pityingly it would cause double-line spacing if this technique was used for newlines. Maybe the lines can be squeezed a bit.