[Bug 1762952] Re: Alternative shortcut for layout switching Alt+Shift unexpectedly set by default

[Gunnar Hjalmarsson]

I took the following steps:

* Installed Ubuntu 17.10.1
* Added an extra keyboard layout
* Updated the packages
* Rebooted

No additional layout switch shortcut so far.

Then I run "update-manager -d", and when it was installing the new and
upgraded packages, a window for keybord configuration popped up and I
was prompted to select method for switching between "setting for
national and latin" (see attached image). Alt+Shift was pre-selected. I
found no way to skip that setting, and clicked the "Forward" button.
Result:

$ cat /etc/default/keyboard
XKBLAYOUT="se,us"
XKBVARIANT=","
BACKSPACE="guess"
XKBMODEL="pc105"
XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll"

So there it is. And at first login those XKBOPTIONS values were imported
by dconf (as expected).

I still can't tell which package is the culprit. Changed to ubuntu-
release-upgrader for now, since it's probably closer to the truth than
gnome-shell.

In any case the upgrade behavior in this respect needs to be
reconsidered, at least for desktop upgrades. No program should make
assumptions and gratuitously set XKBOPTIONS in /etc/default/keyboard,
especially since g-c-c does not offer a way to modify it later. (Is
there a reason for the upgrader to mess with keyboard configuration at
all?)

** Attachment added: "keyboard-config-prompt.png"
   https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1762952/+attachment/5127164/+files/keyboard-config-prompt.png

** Package changed: gnome-shell (Ubuntu) => ubuntu-release-upgrader
(Ubuntu)

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1762952

Title:
  Alternative shortcut for layout switching Alt+Shift unexpectedly set
  by default

Status in gnome-control-center package in Ubuntu:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Version: Ubuntu 18.04 Final Beta with default Gnome Shell included in
  18.04

  Steps to reproduce:
  1. Define two keyboard input methods in Settings -> Region & Language -> Input Sources
  2. Open several applications
  3. Observe that application windows can be iterated with Alt + Tab
  4. Once application window iteration was begun with Alt + Tab, try to iterate backwards with Alt + Shift + Tab.
  5. Try to change keyboard input method switching hotkeys in Settings -> Region & Language -> Input Sources -> Options.
  6. Observe that Keyboard shortcut for "Alternative switch to next source" is set to "Alt + Shift" and that keyboard shortcuts can only be changed in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.
  7. Observe that the shortcut for "Alternative switch to next source" is not available for configuration in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.

  Actual state:
  * Performing step 4 does not select the previous app in application switcher but instead changes  keyboard input method.

  Expected state:
  * The shortcut for "Alternative switch to next source" can be changed and / or deactivated in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.

  Notes:
  * The above was working fine in Ubuntu 17.10. I assume "Alternative switch to next source" did not exist in that version of Gnome Shell.

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