bug#22368: Another way to produce the same result

[Reto Zimmermann]

    Thanks,
    
    vhdl-mode is using function 'comment-region' from the
    ‘newcomment.el’ package. With the default value of 1 for option
    'comment-padding' the comment string "-- " is inserted, resulting in
    
    -- -- this is a test comment
    
    -- library ieee;
    -- use        ieee.std_logic_1164.all
    
    for which uncommenting works fine.  You might have changed
    'comment-padding' to 0, which is when you get
    
    ---- this is a test comment
    
    --library ieee;
    --use        ieee.std_logic_1164.all
    
    For this, 'comment-region' doesn't work correctly for languages with
    comment starts that contain 2 of the same characters, like "--" in
    VHDL or "//" in C++. C++-mode doesn't honor the 'comment-padding'
    option though and always inserts "// ", so the problem doesn't
    occur.
    
    Remedies:

1. Use 1 for 'comment-padding'
2. File a bug report against 'newcomment.el'
3. Make vhdl-mode not honor option 'comment-padding'

    Regards,
    Reto

On 2020-08-18 13:39, Stefan Kangas wrote:

> Hi,
>
> Reto Zimmermann <reto@gnu.org> writes:
>
> > The file is missing.  Could you please re-attach?
> >       
> Sorry, it was missing in my reply.
>
> You can find the file here:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22368#8
>
> Best regards,
> Stefan Kangas
>