LinuxQuestions.org - Fedora 22 gnome Strg + Alt act like AltGr

I'm using the German keyboard layout but I'm used to the Windows behaviour that Strg + Alt acts like the AltGr key. I need it for programming to reach leftbracket etc. easily. I've tried already some stuff and read through man pages and online tuts but nothing works the way I want so far. My most recent attempt was editing the xkb files to add a new variant based on the original german layout.

Code:

$ sudo gedit /usr/share/X11/xkb/symbols/de

...

partial alphanumeric_keys modifier_keys

xkb_symbols "win" {

    // previous standard German layout but CTRL + ALT is level3

        

    include "de(basic)"

    name[Group1]="German (win)";

        

    key <AE07>  {type[Group2]="CTRL_ALT", symbols[Group1]=[7, slash], symbols[Group2]=[braceleft, seveneight]};

        

    include "kpdl(dot)"

};

...

For testing purposes I added only <AE07> but in the end it shall work with <AE08> ... too
The selection of the variant works so far that on the NUMPAD , is now a . (so include "kpdl(dot)" works)

Code:

$ sudo gedit /usr/share/X11/xkb/types/level3



partial default xkb_types "default" {



    // A key type which can be used to implement

    // a windows behaviour to reach level3



    virtual_modifiers Alt;



    type "CTRL_ALT" {

        modifiers = Shift+Ctrl;

        map[None] = Level1;

        map[Shift] = Level2;

        map[Alt+Ctrl] = Level3;

        map[Shift+Alt+Ctrl] = Level4;

        level_name[Level1] = "Base";

        level_name[Level2] = "Shift";

        level_name[Level3] = "Level3";

        level_name[Level4] = "Level4";

    };

};

New entries in evdev.lst and xorg.lst to make the variant available in Settings > Keyboard > Input Sources

Code:

...

  os              ge: Ossetian (Georgia)

  win                  de: German (win)

  deadacute      de: German (dead acute)

...

New entries in evdev.xml and xorg.xml

Code:

...      

<layout>

      <configItem>

        <name>de</name>

        

        <shortDescription>de</shortDescription>

        <description>German</description>

        <languageList>

          <iso639Id>ger</iso639Id>

        </languageList>

      </configItem>

      <variantList>

        <variant>

          <configItem>

            <name>win</name>

            <description>German (win)</description>

          </configItem>

        </variant>

        <variant>

          <configItem>

            <name>deadacute</name>

            <description>German (dead acute)</description>

          </configItem>

        </variant>

...

What am I missing? Please help.