fix(files): fetch directory content on nested files update

[Antreesy]

• Resolves: file size update after editing
• Requires external app to support global Nextcloud events, particularly emit('files:node:updated', node)
  • e.g. Text app should have it

Summary

Reproduction steps:

• Create a .txt file in a folder
• Insert /type a content in it via Text editor
• Wait for app to sync/save the file
• Close editor
• See the correct file size (not 0)

Before	After

TODO

• Test coverage?
• Perf implications?

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[Antreesy]

/compile

[susnux]

This should be handled by the files store not the files list.
The files list should only fetch content when the current folder is changed.

[susnux]

Node updates are handled in the files store, the list only handles updates of the current folder to refetch it because changes on folders often mean that all child nodes are invalidated.

But files are handled in the store, moreover the idea in the files app is to not fetch updates from server, this often causes performance problems because apps might change many nodes at once. Instead the files:node:updated event is for submitting your changes to a node locally so that no server requests are needed.

Meaning the real problem here is that the text app does only update the mtime but not the size when submitting the updated node:

https://github.com/nextcloud/text/blob/34a7c9a4920732d1d611741a59295088557b5ace/src/components/Editor.vue#L736-L737