Keyboard shortcut mapping side effect

[Ragusa]

I have defined a custom shortcut (/usr/bin/guake -t) on the key "§".
The shortcut § works fine, but if I press the letter "s" on my keyboard, Guake is opened as well.

What do I expect:
> That the letter s writes an s.
What's happening:
> Everytime I press "s", guake opens, but I can't use the letter "s" anymore.

I had to map a different shortcut (Maj §) and the "s" works fine.
PS: I am using the Swiss French keyboard configuration

Ubuntu 17.10
gnome-control-center:
  Installed: 1:3.26.1-0ubuntu4

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.26.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 28 16:12:21 2017
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2017-05-21 (160 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
JournalErrors:
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to artful on 2017-10-23 (4 days ago)

[Ragusa (constantin.laurent)]

I just discovered that with the Maj+§ shortcut (Corresponding to °), if I try to insert an equal sign (=), guake opens too.

As the journalctrl command failed, you will find it as an attached file.

[Gunnar Hjalmarsson (gunnarhj)]

I doubt that the keyboard shortcut feature is designed to work with a single character as the shortcut. Try to involve some modifier key, e.g. <Ctrl>, <Alt> or <Super> similarly as the predefined shortcuts.

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.