A few updates back some js was added to do drag&drop file uploads. Works fine for sql files.
does not work for sql.gz
Before any file could be dropped onto the input (this is default behaviour for chrome browser). now I have to click "choose file" and then find it which is a pain.
Bug exists in stable version as well
Last edit: Madhura Jayaratne 2015-06-10
Fixed with https://github.com/phpmyadmin/phpmyadmin/commit/b47e1ce456a886e9ccf68c39afc840d584165ffc
List of compressions allowed is hard coded in JavaScript and this needs to change.