wget2 | --timestamping with --output-document delete file data on second run (#665)

[Pavel Cibulka (@PavelCibulka)]

Pavel Cibulka created an issue: https://gitlab.com/gnuwget/wget2/-/issues/665



this works:

$ wget2 -V
GNU Wget2 1.99.1 - multithreaded metalink/file/website downloader

+digest +https +ssl/gnutls +ipv6 +iri +large-file +nls -ntlm -opie +psl +iconv 
+idn2 +zlib +lzma +brotlidec +bzip2 +http2 +gpgme
$ wget2 -N https://en.wikipedia.org/static/images/icons/wikipedia.png
[0] Downloading 'https://en.wikipedia.org/static/images/icons/wikipedia.png' ...
HTTP response 304  [https://en.wikipedia.org/static/images/icons/wikipedia.png]
$ ls -l wikipedia.png 
-rw-r--r-- 1 pavel pavel **13444** kvě  6 14:25 wikipedia.png
$ wget2 -N https://en.wikipedia.org/static/images/icons/wikipedia.png
[0] Downloading 'https://en.wikipedia.org/static/images/icons/wikipedia.png' ...
HTTP response 304  [https://en.wikipedia.org/static/images/icons/wikipedia.png]
$ ls -l wikipedia.png 
-rw-r--r-- 1 pavel pavel **13444** kvě  6 14:25 wikipedia.png

this delete all data in file

$ wget2 -N https://en.wikipedia.org/static/images/icons/wikipedia.png -O 
wikipedia2.png
[0] Downloading 'https://en.wikipedia.org/static/images/icons/wikipedia.png' ...
Saving 'wikipedia2.png'
HTTP response 200  [https://en.wikipedia.org/static/images/icons/wikipedia.png]
$ ls -l wikipedia2.png 
-rw-r--r-- 1 pavel pavel **13444** kvě  6 14:25 wikipedia2.png
$ wget2 -N https://en.wikipedia.org/static/images/icons/wikipedia.png -O 
wikipedia2.png
[0] Downloading 'https://en.wikipedia.org/static/images/icons/wikipedia.png' ...
HTTP response 304  [https://en.wikipedia.org/static/images/icons/wikipedia.png]
$ ls -l wikipedia2.png 
-rw-r--r-- 1 pavel pavel **0** kvě 13 16:31 wikipedia2.png

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