You may add the /Box/ property to the default face, but I'm afraid all of your Emacs will look quite ugly. M-x customize-face
– JuanchoOct 21 '16 at 19:44
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.
– TobiasOct 21 '16 at 20:37
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.
– DanOct 21 '16 at 23:33
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.
– TobiasOct 22 '16 at 00:29
defaultface, but I'm afraid all of your Emacs will look quite ugly.M-x customize-face– Juancho Oct 21 '16 at 19:44#x0Ccan be displayed as horizontal line with the packagesform-feedandpage-break-lines. Pityingly it would cause double-line spacing if this technique was used for newlines. Maybe the lines can be squeezed a bit. – Tobias Oct 21 '16 at 20:37