"Toggle" should mean "show or hide all windows", not "flip the visibility state
of windows". Case: one receiver window is open. When a new receiver is
connected, I also expect it to be open. Instead it is hidden, so I click the
icon. Now the new receiver window is shown, but the previous one is hidden.
Huh?! Indeed, let's fix that.
The problem is caused by starting Solaar right after installing it; while udev
does have the new rule loaded, the /dev/hidraw* device nodes already exist
with the old permissions.
Rather than doing a "udevadm --reload-rules" (which could have unknown side-
effects on other devices), instruct the user to remove and re-insert the usb
receiver. The new /dev/hidraw* device nods will be created with the right
permissions.