Hi devs, In Export we can ask for a gzip compression. On Apache server with mod_deflate, this *can* produce a doubly-compressed file, depending on the Apache configuration (see [0]).
We can detect whether mod_deflate is loaded, but not whether it's configured to compress only certain MIME types. The detection is in place, producing bug [1].
So I suggest to disable gzip compression in the export choices, when we detect the presence of mod_deflate.
[0] https://sourceforge.net/p/phpmyadmin/bugs/3673/
[1] https://sourceforge.net/p/phpmyadmin/bugs/4025/