Up until now aria2 file auto renaming worked by just appending a new
unique number to the file path, behind the file name extension, if any,
changing what most other programs consider the file extension in the
process.
Now, aria2 will attempt to insert the number before the file extension,
leaving the extension intact, so that e.g. a ".jpg" still is a ".jpg"
file and opens in your configured image viewer when clicking it.
If a file has no extension (incl. so called "dot files"), the number
will be appended to the file name as usual.
Note: This is a potentially breaking change that might break third party
scripts that rely on aria2 auto file renaming producing a certain format
for renamed files. Please fix your scripts accordingly.
Closes GH-709