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

[Łukasz Zemczak]

Indeed, this is postinst so the value is "configure" for all successful
upgrades. What could be done is actually only checking if $2 exists or
not, since if I remember correctly we only have postinst configure
called with a version number in the case of upgrades or downgrades -
which I suppose don't matter as in case of downgrading to an older
version that we expect modify /etc/default/keyboard then anyway the
destination version's postinst is executed. And I suppose the same thing
happens for packages that are in the config-installed state, but that
shouldn't be a problem for us (since it means postinst ran at least once
anyway).

Probably needs checking.

Could you check if only doing a test for the existence of $2 would
suffice? This could probably be added to the existing conditional and
make the maintscript look better.

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

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

Status in console-setup package in Ubuntu:
  In Progress
Status in gnome-control-center 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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