OpenWithService change seems to be breaking changes

[bhufmann]

Bug Description:

When upgrading the theia-traceviewer (eclipse-cdt-cloud/theia-trace-extension#1085) to recent Theia community release 1.49.1, I noticed that the feature Open With -> Trace Viewer is not working anymore. It is used to open trace files or trace folders from the navigator's Open With menu when selecting either a file or folder. I figured out how to fix it (see PR).

I think this should be mentioned as a breaking change in the CHANGELOG.md#breaking_changes

Additional Information

• Operating System: All
• Theia Version: 1.49.1

Related change: #13573

[JonasHelming]

@msujew

[tortmayr]

I agree, we also encountered issues with the changed behavior of open with when upgrading GLSP projects.
The changes of #13573 are technically not breaking any API, but they introduce a behavioral change which still should be mentioned in the changelog.
Before this change any widget/view etc. configured with a OpenHandler would indirectly also be available in the open with context menu. With the introduction of the OpenWithService this is no longer the case. If adopters want that their custom opener shows up as open with candidate they have to manually inject the OpenWithService and register a handler for it.

[msujew]

Sorry, right. I didn't really think about people relying on the implicit behavior that existed previously. I'll provide a patch for that tomorrow.