We should not blindly remove the leftover settings file, as the following write()
operation could fail and the user would lost all settings.
We should try renaming it instead.
We need to be careful when using the multi-arg version of
QString::arg() and passing as 2nd, 3rd etc parameter an int.
It doesn't do the same as passing multiple QStrings.
Enable backtrace stuff only if GNU C library used, because current
backtrace implementation based on <execinfo.h> , which is not a
part of standard C library, it is a GNU extension.
This will be usefull when building with custom POSIX-compilant C
library (like musl) and no <execinfo.h> available.
Note: configure script will detect presence of <execinfo.h> and
enable/disable feature depending on it.
Feature is enabled by default.
Libtorrent can recheck only unpaused torrents. We get around this by
unpausing the torrent, issuing the recheck and pausing again after we
get alerted by libtorrent that the recheck has finished. This alert is
asyncronous. There is a small time frame where the program might start
downloading and writing data to the file before we pause it. This can
lead to data corruption if the file on disk is totally different that
the one expected by the torrent AND the file on disk is a valid file on
its own. OR in case the user points the new torrent to the wrong
directory by mistake.
To get around this the torrent is placed in upload_mode and out of
automanagement.
Need to split arguments manually because QProcess::startDetached(QString)
will strip off empty parameters.
E.g. `python.exe "1" "" "3"` will become `python.exe "1" "3"`.
Closes#8454.
Using iostream usually adds a lot of other operators (<<, endl), whereas
*printf takes only 1 function call.
Also use qUtf8Printable whenever possible.
sledgehammer999