Re: The `^L' appeared in built-in help.

[Hongyi Zhao <hongyi.zhao@gmail.com>]

On Tue, Jul 6, 2021 at 7:07 PM Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
>
> On Tue, Jul 6, 2021 at 6:46 PM Emanuel Berg via Users list for the GNU
> Emacs text editor <help-gnu-emacs@gnu.org> wrote:
> >
> > Hongyi Zhao wrote:
> >
> > > The screenshot is generated by `C-x 8 RET c', but `M-x
> > > describe-char RET' for the result character says that it
> > > should be input by `C-x 8 RET 6', as you can see in the
> > > screenshot. So, I'm confused on this problem.
> >
> > Here are mine, C-x 8 RET 6 RET
> >
> >
> >
> > and C-x 8 RET c RET
> >
> >
> >
> > and M-x insert-char RET form feed (ff) RET
> >
> >
> >
> > The char that looks like ^F is:
> >
> >              position: 894 of 959 (93%), restriction: <544-960>, column: 0
> >             character: C-f (displayed as C-f) (codepoint 6, #o6, #x6)
> >               charset: ascii (ASCII (ISO646 IRV))
> > code point in charset: 0x06
> >                script: latin
> >                syntax: .        which means: punctuation
> >              to input: type "C-x 8 RET 6" or "C-x 8 RET ACKNOWLEDGE"
> >           buffer code: #x06
> >             file code: #x06 (encoded by coding system utf-8-emacs)
> >               display: terminal code #x06
> >        hardcoded face: escape-glyph
> >
> > Character code properties: customize what to show
> >   old-name: ACKNOWLEDGE
> >   general-category: Cc (Other, Control)
> >
> > There are text properties here:
> >   fontified            t
> >
> > and the char that looks like ^L is:
> >
> >              position: 950 of 1750 (54%), restriction: <544-1751>, column: 0
> >             character: C-l (displayed as C-l) (codepoint 12, #o14, #xc)
> >               charset: ascii (ASCII (ISO646 IRV))
> > code point in charset: 0x0C
> >                script: latin
> >                syntax:          which means: whitespace
> >              to input: type "C-x 8 RET c" or "C-x 8 RET FORM FEED (FF)"
> >           buffer code: #x0C
> >             file code: #x0C (encoded by coding system utf-8-emacs)
> >               display: terminal code #x0C
> >        hardcoded face: escape-glyph
> >
> > Character code properties: customize what to show
> >   old-name: FORM FEED (FF)
> >   general-category: Cc (Other, Control)
> >
> > There are text properties here:
> >   fontified            t
> >
>
> I find the clues: if I run `emacs -Q', the results will be the same as
> yours. If I run  `emacs', the problem reported here will happen. So
> the problem is triggered by some configurations in my
> `~/.emacs.d/init.el'. But I still can't find out the specific
> configuration which caused the problem.

I found the reason: it is caused by the following configuration:

```
(straight-use-package
 `(swiper :type git :host github :repo "abo-abo/swiper"
    :pre-build (
               ;("bash" "-c" "cd ~/.emacs.d/straight/repos/swiper")
               ;https://github.com/abo-abo/swiper/issues/2886#issuecomment-860605327
               ("make" "deps")
               ("make" "compile")
               )))

(require 'ivy)
(ivy-mode 1)
(setq ivy-use-virtual-buffers t)
(setq ivy-count-format "(%d/%d) ")
```

But I still can't figure out why this configuration will trigger the
above problem.

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China