It was always eating two characters more than needed.
A toxURI passed to handleToxURI always starts with "tox:", it's checked in the handleToxURI callers. So here we need to remove that prefix, that's long 4 characters and not 6.
The previous code was meant to handle tox:// and tox: cases, but the tox:// case is invalid and should not be handled (see #2118).
Fixes: d6a0910fc8 ("fix uri parsing and tox URI detection, closes#2118")
If you restart qTox in the middle of downloading an update, it would continue to download the update correctly but the progress bar would go from 0 to 50% instead of resuming from 50 to 100%
This avoids problems with friends who rarely restarts their client. The overhead of sending a file transfer request that gets rejected should be negligible
The qTox Project is not associated with the Tox Project in any way, with the
exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
In particular, the Tox Projet does not own copyright over the qTox Project's
"qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox
contributors, and no partiular rights are granted to the Tox Project.
