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Add CLUTTER_IM_COMMIT/DELETE events

Carlos Garnacho requested to merge wip/carlosg/im-events into master

Some input methods have a strong reliance in the order of events emitted (eg. a sequence of commit-text and forward-key-press), but we break this order as we handle commit-text and delete-surrounding immediately, while forwarded key events are injected into the event queue for the usual processing.

In order to preserve the ordering here, add CLUTTER_IM_COMMIT and CLUTTER_IM_DELETE events, so that the input method will queue those events in a fixed relative order wrt forwarded key events. The handling becomes:

  • ClutterInputMethod queues the IM events
  • Those get processed the same way than key events
  • The key focus forwards the IM event to the ClutterInputFocus
  • The ClutterInputFocus does the IM action

CC @fujiwarat @pwu, IIUC this should fix the issues with hangul.

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