Feature request - show markers in terminal emacs

[diamond-lizard]

It would be great if bookmark markers could be shown in terminal emacs.

Since terminal emacs doesn't have the fringe, they obviously can't go there. So there has to be some other way to display them.

Perhaps overlays could be used, with user-configurable properties, such as background and/or foreground color.

This way, maybe bookmarked lines could be indicated with, say, a user-configurable background color on lines that have bookmarks.

Allowing these markers to be toggled on and off would prevent them from permanently interfering with existing text properties or overlays in the buffer.