bug#21766: 25.0.50; delete-trailing-whitespace sometimes deletes non-whitespace

[martin rudalics]

>> No, skip-syntax-backward is safe.  There must be something in
>> line-beginning-position that does this, but only indirectly.
>
>    (skip-syntax-backward "-"
>          (save-match-data
> (line-beginning-position)))
>
> still shows the bug, while
>
>    (save-match-data
>      (skip-syntax-backward "-" (line-beginning-position)))
>
> fixes it.

I doubt that ‘syntax-propertize’ is always safe.

martin