bug#48901: [kisara.moe] 28.0.50; Support text-based fringe contents alongside bitmaps

[Eli Zaretskii]

> From: mohsin kaleem <mohkale@kisara.moe>
> Date: Mon, 07 Jun 2021 14:30:23 +0100
> 
> 
> This is more a feature request than a bug-report. At the moment the
> recommended way to show extra information about certain lines in a
> buffer is the fringe. This is done by defining a fringe-bitmap and then
> having that render onto the fringe, however this is a graphical
> only solution and terminal frames don't support this. Some packages such
> as flycheck let you work around this by rendering what you would've
> rendered on the frame, onto the margin which supports rendering regular
> strings (alongside any other string-properties such as faces) that can
> be visible in both terminal and GUI frames.
> However as a solution that isn't ideal, for one margins weren't designed
> for this purpose and for another there doesn't seem to be a way to set
> the background or other properties of a margin to make it resemble the
> fringe (in my case I'd like the background of the margin to match
> the fringe background but only for the left margin where I will show the
> fringe indicators). There's also the issue with interference between
> this representation and other packages such as olivetti that use the
> margin to center text.
> I'd like to recommend we support rendering both text and bitmaps onto
> the fringe, rendering nothing (or perhaps a block element) if a package
> tries to render a bitmap on a terminal frame.

Sorry, I don't understand: you begin by saying that fringe bitmaps
have a disadvantage for TTY frames, and end by requesting a different
features with the same disadvantage?  Or what did I miss?