* Provide a widget that can be used in a collaborative document to display current users

* Automatic application of license header

* Move the widget to collaboration package

* Add style and allow empty model (for notebook panel for example)

* Send the document model to the iconRenderer, and avoid displaying cursor on Anonymous icons

* Improve the default icon renderer

- allow the default renderer to receive additional classes
- rename it for consistency
- avoid sending non related props to div element

* CSS

* lint

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

* Gracefully handling non-existing fork room

* Handle RoomNotFound error on fork creation

* Missing return

* Apply suggestions from code review

Co-authored-by: David Brochart <david.brochart@gmail.com>

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Co-authored-by: David Brochart <david.brochart@gmail.com>

* Update event schema version type

* Tweak maxDiffPixelRatio

* Set maxDiffPixelRatio to 0.001

Co-authored-by: Duc Trung Le <leductrungxf@gmail.com>

* Set maxDiffPixelRatio to 0.01

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Co-authored-by: Duc Trung Le <leductrungxf@gmail.com>

* Use content providers (v2)

Co-authored-by: davidbrochart <davidbrochart@users.noreply.github.com>

* Reduce the diff

* Rewrite logic which used to rely on RTC prefix, cleanup

* Update to JupyterLab v4.4.0a2

* Align TypeScript version with JupyterLab, re-enable lib check

* Fix TypeScript tests

* Bump JupyterLab version used in CI tests

* Bump JupyterLab installed with `dev_install`

* Fix "Test Minimum Versions" job

* Run UI tests on 4.4.0a2 or newer

* Expect the copied link to not have `RTC:` prefix

* Set awareness for user regardless of RTC prefix

* Match any file, not only files starting with letters

* Fix opening collaborator's file (remove no-longer needed RTC prefix)

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Co-authored-by: davidbrochart <davidbrochart@users.noreply.github.com>

…ion (#427)