Fix movtodesk dispatchers

[WhySoBad]

Hi,

Since the switch from std::regex to re2 as a regex library for hyprland (hyprwm/Hyprland@e06b520) the movetodesk dispatcher(s) are kind of broken.

For example with the config:

plugin {
    virtual-desktops {
        cycleworkspaces = 0
        notifyinit = 0
        names = 1:1, 2:2, 3:3, 4:4, 5:5
    }
}

I previously was able to switch vdesks using dispatch movetodesk <id> where <id> is either 1, 2, 3, 4 or 5.

When I dispatch movetodesk 2 without further arguments we have arg = '' in the VirtualDeskManager::moveToDesk method.

hyprland-virtual-desktops/src/VirtualDeskManager.cpp

Lines 117 to 121 in 45001c5

	PHLWINDOW window = g_pCompositor->getWindowByRegex(arg);
	if (!window) {
	printLog(std::format("Window {} does not exist???", arg), eLogLevel::ERR);
	return vdeskId;
	}

We then call getWindowByRegex(arg) which now returns no window (probably due to us passing an empty string and re2 not liking this in comparison to std::regex which most likely just returned the current window). This causes the assertion and therefore every move to fail.

I've now wrapped the whole assertion into a check whether arg is non-empty. Since we only use the window from getWindowByRegex to determine the target monitor we set monitor to the current monitor by default. Should arg be non-empty we try to get a window matching the arg and set monitor to the monitor of the matched window. If no window matches we currently just return and don't move anything. I think it would be better when we log some error and then move to the default monitor (which is the current monitor) as it's probably more like the functionality which was tried to be achieved by the user.

I'm not entirely sure whether this could break some control flows as I don't have this deep of an understanding of the functionalities of the plugin which I only rarely use

[levnikmyskin]

LGTM, don't think this should break anything. The new Hyprland broke window rules anyway, so I guess this is expected