Cannot increase font-size with <CTRL><+> - Incorrect localization

[xypron]

Describe the bug

I am running the Kubuntu desktop on Ubuntu Plucky with a German keyboard. The font size cannot be increased using <CTRL><+>.

To Reproduce

With <CTRL><-> I can reduce the font-size but <CTRL><+> does not increase it.
Instead <CTRL><´> increases the size. This letter is located where a US-keyboard has the <+>.

German keyboad layout

Expected behavior

<CTRL><+> increases the font size.

Additional info

Ubuntu 25.04 with KDE desktop
multipass 1.16.0-dev.88+gfc3249cee
multipass driver: libvirt

VM:
Name: name
State: Running
IPv4: 192.168.122.171
Release: Ubuntu 22.04.5 LTS
Image hash: 0ba0fd632a90 (Ubuntu 22.04 LTS)
CPU(s): 2
Load: 0.00 0.19 0.19
Disk usage: 3.6GiB out of 11.6GiB
Memory usage: 190.7MiB out of 957.2MiB
Mounts: --

[giuliazanchi]

Hi @xypron , thanks for reporting this issue. After some initial investigation, it could be related to how this functionality has been implemented in the code. We'll follow up as soon as possible.