Error with printing interface

Error with printing interface

[Herbert Euler]

I found a problem with printing interface.  Here is how to reproduce:

- Turn on printing interface with the following:

  (require 'printing)
  (pr-update-menus)

- Visit lisp/printing.el.  Do not set a region in it after opening.

- Open printing interface: Click on File -> Print -> Printing
  Interface.

- Click on the [Preview] button.  An error is signaled: Args out of
  range: X, X, where X is an integer, and the two integers are the
  same.

I tried to debug, and found this:

- M-x debug-on-entry RET auto-compose-region RET

- Click on the [Preview] button again.

- Keep typing d to skip uninterested function callings, stop at the
  calling to selected-window.

- Type d or c, I got #.

I guess this explains why there is an error, because I observed that
the integer X in the error message is always greater than (point-max)
of *Printing Interface*.  While I did not see the value of
(selected-window) in the case when the size of the buffer or a region
in the buffer is less than the size of *Printing Interface*, I'm not
sure.

I can generate a ps file with e.g. (pr-text2ps 'buffer 1 "~/tmp/abc")
in the buffer printing.el, though.

Regards,
Guanpeng Xu
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RE: Error with printing interface

[Herbert Euler]

> - Type d or c, I got #.

I meant # < window 16 on *Printing Interface*> here.

Regards,
Guanpeng Xu
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Re: Error with printing interface

[Vinicius Jose Latorre]

Hi Guanpeng Xu,


> I found a problem with printing interface.  Here is how to reproduce:
>
> - Turn on printing interface with the following:
>
>   (require 'printing)
>   (pr-update-menus)
>
> - Visit lisp/printing.el.  Do not set a region in it after opening.
>
> - Open printing interface: Click on File -> Print -> Printing
>   Interface.
>
> - Click on the [Preview] button.  An error is signaled: Args out of
>   range: X, X, where X is an integer, and the two integers are the
>   same.
>
> I tried to debug, and found this:
>
> - M-x debug-on-entry RET auto-compose-region RET
>
> - Click on the [Preview] button again.
>
> - Keep typing d to skip uninterested function callings, stop at the
>   calling to selected-window.
>
> - Type d or c, I got #.
>
> I guess this explains why there is an error, because I observed that
> the integer X in the error message is always greater than (point-max)
> of *Printing Interface*.  While I did not see the value of
> (selected-window) in the case when the size of the buffer or a region
> in the buffer is less than the size of *Printing Interface*, I'm not
> sure.
>
> I can generate a ps file with e.g. (pr-text2ps 'buffer 1 "~/tmp/abc")
> in the buffer printing.el, though.
>   

Well, it seems that this problem is related with auto-compose-region 
function.

auto-compose-region calls font-at which needs a window (selected-window) 
as a parameter, but the current selected window is displaying *Printing 
Interface* buffer instead of printing.el buffer.

I don't know if it is possible to get a font-object from a buffer 
without being displayed.

Kenichi, what is your opinion?