Why is `(1 . width)` zero?

["Jörg Sommer" <joerg@jo-so.de>]

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Hi,

I'm using GNU Emacs 27.1¹ with X and the font DejaVu Sans Mono. I would like
to align a text on the right side and thought I can use this:

```lisp
(let* ((text " abcd")
       (len (length text))
       )
  (add-text-properties 0 1 `(display (space :align-to (- text (,len . width)))) text)
  (insert "\n" (format "%S" text) "\n" text "\n"))
```

but it doesn't work. The text is outside the visible space. Similar with a
text that should be indented:

```lisp
(let ((text " abcd"))
  (add-text-properties 0 1 `(display (space :width (10 . width))) text)
  (insert "\n" (format "%S" text) "\n" text "\n"))
```

It shows up in the first column. But in the TUI it works. So, what's wrong
with `width` in GUI?

My main goal is to place a text on the right side that the user might scale
down with face attributes:

```lisp
(set-face-attribute 'lsp-ui-sideline-global nil :height 0.5)

(let* ((text " abcd")
       (len (length text))
       )
  (add-text-properties 0 len '(font-lock-face (error lsp-ui-sideline-global)) text)
  (add-text-properties 0 1 `(display (space :align-to (- text (,len . width)))) text)
  (insert "\n" (format "%S" text) "\n" text "\n"))
```

Are there any other ways to get this?


Kind regards

Jörg


¹ build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0
  of 2020-11-08, modified by Debian

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