Fix internal links in direct-edit sessions

[Raudius]

📝 Summary

• Resolves: Direct editing breaks with internal links #1169
• Partially addresses: Properly handle linked files with direct editing #1170

Internal links previously relied on OCA.Viewer to fetch the relative path of the document. In direct-edit sessions OCA.Viewer is not set.

This PR adds a check for OCA.Viewer before handling internal links.

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[cypress]

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Test summary

105 • 1 • 0 • 0 • 0

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Run details

Project	Text
Status	Failed
Commit	e30bbf3 ℹ️
Started	Nov 17, 2022 12:03 PM
Ended	Nov 17, 2022 12:10 PM
Duration	06:24 💡
OS	Linux Ubuntu -
Browser	Electron 106

View run in Cypress Dashboard ➡️

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Failures

	cypress/e2e/sections.spec.js		1
1	Content Sections > Heading anchors > Anchor scrolls into view

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[cypress]

2 flaky tests on run #8762 ↗︎

0

137

0

0

2

Details:

Fix internal links in direct-edit sessions
Project: Text	Commit: 2ff4f17202
Status: Passed	Duration: 03:16 💡
Started: Feb 27, 2023 9:37 PM	Ended: Feb 27, 2023 9:40 PM

  sync.spec.js • 1 flaky test

View Output Video

Test
Save > saves the actual file and document state		Screenshot

  viewer.spec.js • 1 flaky test

View Output Video

Test
Open test.md in viewer > Closes the editor		Screenshot

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[juliusknorr]

Cypress failures are unrelated. Will push a fix for a recent server change shortly.

[juliusknorr]

Fix in nextcloud/server#35866

[max-nextcloud]

I tried to create a cypress test for this here: https://github.com/nextcloud/text/tree/test/direct-editing-with-link

But the test won't fail even with the current master. So i am obviously failing to understand somethign about the underlying problem. Could you take a look at the test and check what i am missing?

[mejo-]

@juliushaertl is this PR still ready to be merged? Since you approved it earlier, is there a reason not to merge it?

[juliusknorr]

/compile

[juliusknorr]

Nothing blocking from my side, let's get this in