Use QProcess::execute() with the 'safer' argument-list, rather than
escaping and de-escaping strings. Also reduce noise by only passing
a variant if there is one.
When selecting keyboard layout, pause, then select another, the
QTimer wasn't being disconnected from the previously selected
language, so the second selection would fire the timeout, and
then call *two* slots .. and then three, ... Disconnect when
the timer fires, too.
In order to avoid deep copies, Qt containers over which we iterate must be const
The remaining unported cases require qAsConst (Qt 5.7) or std::as_const (C++17)
This is implemented as a new SetKeyboardLayout job that does the work.
Portions of the code are adapted from systemd-localed's source code,
which is under a compatible license (LGPLv2.1+, can be converted to our
GPLv3+ license). I ported it from C to to C++/Qt and made some minor
tweaks to the mapping logic (from X11 to vconsole layouts) though.
Fixes#31.
Tested on a Fedora Remix (Kannolo 21) with the default module settings
(finds the converted X11 keymaps for the virtual console) and with
convertedKeymapPath: "" (does the legacy keymap conversion as expected).
