Gnome 3.22: disable alt+shift keyboard layout switching

Question

I'm developing an app for ios 9. since that I updated to 7.1 version I have this error: Command failed due to signal: Segmentation fault: 11

Looking in the code, I found that this code are causing this error:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    if !(annotation is ADBaseAnnotation){
        print("No es ADBaseAnnotation",terminator:"\n")
        return nil
    }

    var anView = mapView.dequeueReusableAnnotationViewWithIdentifier((annotation as! ADBaseAnnotation).getReuseId())
    if let normal = annotation as? NormalParking {
        //anView = normal.getAnnotationView(annotation, reuseIdentifier: normal.getReuseId())
    } else if let hightlight = annotation as? HightLightParking{
        //anView = hightlight.getAnnotationView(annotation, reuseIdentifier: hightlight.getReuseId())
    }
    return anView
}

The error is causing by the commented lines. Please help

Solution 1

Okay, got it: this line in my /etc/default/keyboard

XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll"

.. should not contain grp:alt_shift_toggle, which is the relevant xkb option according to this post.

In addition, Gnome overrides xkb options according to this other post. As a consequence, this output:

$ dconf read /org/gnome/desktop/input-sources/xkb-options
['grp:alt_shift_toggle','grp_led:scroll']

.. should not read grp:alt_shift_toggle on my machine either. So after I ran:

dconf write /org/gnome/desktop/input-sources/xkb-options "['grp_led:scroll']"

I got my good'ol behaviour back ;)

---

I have filed this as a bug to Gnome.

Solution 2

In my case I'm using Ubuntu 18.04. I was able to solve this problem by re-configuring my keyboard setting:

$ sudo dpkg-reconfigure keyboard-configuration

Comments

[ClarkXP]

Hi, effectively ADBaseAnnotation is a shared class. The compiler was falling by unknown error, aren't syntax error. Before update Xcode, was working this code. I tested your code and works fine. Gracias!

[Lucas van Dongen]

It could be possible that your code was correct but too confusing to the compiler. Swift is barely a year old! I had a similar issue with map filter on a tuple, some weird chain of methods that it couldn't resolve.

[hb20007]

I was able to disable the Alt + Shift shortcut for changing keyboard layout by disabling the shortcut in Settings > Keyboard > Shortcuts > Typings > Modifiers-only switch to next source. Yes, the name is quite vague but you can see that it's mapped to Alt + Shift.

[iago-lito]

@hb20007 I think this is the naive first try that surprisingly didn't work in my case back then. However, the navigation was a little different from the one you are describing. Which version of gnome are you talking about?

[hb20007]

gnome-shell --version gives 3.18.5

[iago-lito]

@hb20007 Okay, I get it then. This post is about a problem occuring on 3.22, which is the reason why it works fine in your case :)

[php_nub_qq]

For anyone else wondering why this is not working for them - don't run it as root :)