Preview feature makes the app unresponsive

[nabim777]

Describe the bug

The UI freezes or becomes unresponsive when using the Preview feature.

Steps to reproduce

1. Upload an image test.png
2. Open the image test.png
3. Using the sidebar, navigate to the actions section
4. When a user clicks the preview and closes the image

Expected behavior

The preview should work without affecting the UI.

Actual behavior

The UI freezes or becomes unresponsive after closing the image

Screencast.from.01-17-2025.12.55.58.PM.webm

Tested on

Infinite Scale 7.1.0-rc.1 Community
ownCloud Web UI 11.1.0

[saw-jan]

^ @LukasHirt

[LukasHirt]

When a user clicks the preview and closes the image

By this, you mean that the user clicks on the "Preview" action in the sidebar?

[saw-jan]

yeah. looks like it

[LukasHirt]

Ok, the bug was introduced in #12040 When clicking on the Preview action and then closing the editor, it actually does not close it but goes back to the editor again because the Preview action adds another editor route into the history. However, somehow it drops the context query causing the UI freeze.

Fixing the bug is very simple as I only need to add a check whether the context query is there and if not, do not try to access the hidden state. I would like to fix the underlying issue first though because even if the UI does not freeze, it still requires the user to click twice on the close button to actually close the editor.