FileDialog::FileDialog(...) resets (and overwrites) the Sidebar URLs in LMMS and other QT apps

[khoidauminh]

System Information

Archlinux

LMMS Version(s)

nightly

Most Recent Working Version

No response

Bug Summary

When the file picker is launched in LMMS (via exporting, opening or other operations), previous bookmarks from LMMS and other Qt applications are overwritten and lost.

Expected Behaviour

Previous bookmarks/configuration of the URL Sidebar remains.

Steps To Reproduce

1. In other QT apps (e.g Krita), open the file dialog and add any bookmark.
2. Open the dialog again in that app (e.g Krita) to verify that the bookmark is there.
3. Open LMMS and activate the file dialog.

Logs

Click to expand

Screenshots / Minimum Reproducible Project

https://github.com/user-attachments/assets/c12913d3-45aa-4ba0-b402-215fff58a790

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