Are you using some layout which is not provided by xkb-data?

The one I used is named "French (alt., Latin-9 only)" and is represented
by the dconf value fr+oss_latin9. The dconf value fr+latin9 is also
available, but the name of that layout is "French (legacy, alt.)".

I'm not sure about the significance of which particular layout is used,
though. But I'm wondering in what way your observation results in
unexpected behavior for the user. Yes, there are differences under the
hood. But how is that important in practice?

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Touch seeded packages, which is subscribed to ibus in Ubuntu.
https://bugs.launchpad.net/bugs/1999207

Title:
  Error in dead key management of latin keyboards

Status in ibus package in Ubuntu:
  Incomplete

Bug description:
  Composition events are incorrect in Ubuntu 22.04 for latin keyboard

  I opened an issue at Firefox
  [here](https://bugzilla.mozilla.org/show_bug.cgi?id=1802989) that
  gives all the details, but they diagnosed a bug in ubuntu-ibus

  To reproduce the issue, you can go
  [here](https://developer.mozilla.org/en-
  US/docs/Web/API/Element/compositionstart_event#result) and type ^+u
  with a fr+latin9 keayboard configuration.

  Here is the conclusion on the bug report:

  Ubuntu-ibus commits dead key sequence with empty string first, then,
  sends only commit string without "composing" state. The latter
  behavior is a usual case for inputting non-ASCII characters like
  Emojis. In this case, browsers need to handle it without composition
  for compatibility between browsers. Therefore, we cannot represent the
  composed character insertion as a set of composition events. Anyway,
  dispatching 2 set of composition events for one dead key sequence may
  cause trouble in web apps. Therefore, as expected, the first
  composition should update the "preedit string" to the composed string
  and commit it simply.

  The bug was reproduced with installing Ubuntu 22.04 with English
  locale and adding "French (alt., Latin-9 only)" keyboard layout. And
  also reproduced with the other Western keyboard layouts which have
  dead keys.

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