[Bug 1585797] [NEW] Distinguish between input method "XIM" and "none"

[Gunnar Hjalmarsson]

Public bug reported:

[Impact]

language-selector-gnome includes a GUI to configure the input method via
im-config. Besides the installed IM frameworks (IBus, Fcitx, etc.) the
IM selector shows a "none" option, which actually represents the value
"xim". This was an intentional simplification, made under the assumption
that "none" and "xim" are approximately the same. However, it has proven
to be an oversimplification. For example there is a need sometimes to
control whether the X11 compose keys should be active or not.

This SRU adds an explicit "XIM" option, and converts the "none" option
to actually set "none".

A recent reason why an explicit "none" option is needed is Ubuntu MATE,
which does not install any IM framework by default for non-CJKV users.
Currently, when such a user opens Language Support for the first time,
the input method selector shows a blank value. With this SRU it will
correctly show "none".

[Test Case]

An example test case would be:

* Make a fresh install of Ubuntu MATE 16.04.
* Open Language Support and find that the input method value is blank.

[Regression Potential]

Low. This won't *change* the input method setting, but the currently set
value will be showed more correctly in some cases.

** Affects: language-selector (Ubuntu)
     Importance: Medium
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: language-selector (Ubuntu Xenial)
     Importance: Medium
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Also affects: language-selector (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: language-selector (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: language-selector (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: language-selector (Ubuntu Xenial)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

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https://bugs.launchpad.net/bugs/1585797

Title:
  Distinguish between input method "XIM" and "none"

Status in language-selector package in Ubuntu:
  In Progress
Status in language-selector source package in Xenial:
  In Progress

Bug description:
  [Impact]

  language-selector-gnome includes a GUI to configure the input method
  via im-config. Besides the installed IM frameworks (IBus, Fcitx, etc.)
  the IM selector shows a "none" option, which actually represents the
  value "xim". This was an intentional simplification, made under the
  assumption that "none" and "xim" are approximately the same. However,
  it has proven to be an oversimplification. For example there is a need
  sometimes to control whether the X11 compose keys should be active or
  not.

  This SRU adds an explicit "XIM" option, and converts the "none" option
  to actually set "none".

  A recent reason why an explicit "none" option is needed is Ubuntu
  MATE, which does not install any IM framework by default for non-CJKV
  users. Currently, when such a user opens Language Support for the
  first time, the input method selector shows a blank value. With this
  SRU it will correctly show "none".

  [Test Case]

  An example test case would be:

  * Make a fresh install of Ubuntu MATE 16.04.
  * Open Language Support and find that the input method value is blank.

  [Regression Potential]

  Low. This won't *change* the input method setting, but the currently
  set value will be showed more correctly in some cases.

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