--toggle-visibility Does Not Work with "Hide on lose focus" when Set via Global Shortcuts

```
$ guake --version
Guake Terminal: 3.2.2
VTE: 0.52.1
VTE runtime: 0.52.1
Gtk: 3.22.30

$ head -n2 /etc/os-release
NAME="Ubuntu"
VERSION="18.04 LTS (Bionic Beaver)"
```
Installed from source. If I select the option "Hide on lose focus", the following work as expected:
* The "Toggle Guake visibility" keyboard shortcut set in Guake preferences
* The following command run from e.g. `gnome-terminal`: `guake -t; sleep 2; guake -t`

However, if I set a keyboard shortcut in Gnome preferences to the command `guake -t` or `dbus-send --type=method_call --dest=org.guake3.RemoteControl /org/guake3/RemoteControl org.guake3.RemoteControl.show_hide`, the window immediately reappears after disappearing. The messages when I press the hotkey are:
```
Hiding on focus lose
Showing the terminal
```
This only happens when I use the Gnome keyboard shortcut. I can reproduce it at current HEAD and tag 3.2.1.