Crash when dragging-and-dropping file with accented characters (é, è, ç) for upload

[el-badr]

Environment:

• OS: Kubuntu 25.1
• Installation Method: Flatpak through KDE Disocver store
• Edge Version: 144.0.3719.115 (happened with older versions too)
• KDE Plasma Version: 6.4.5
• Qt Version: 6.9.2

Bug Description:
Microsoft Edge crashes 100% of the time when I drag a file from the Dolphin file manager into any webpage's file upload area (e.g., an email attachment field), if the file's name contains accented characters like é, è, à, ç etc. this doesn't happen with other browsers like Firefox

Steps to Reproduce:

1. Open Microsoft Edge (Flatpak version).
2. Navigate to any website with a file upload form (e.g., Gmail, test virus etc.).
3. In the file manager (Dolphin), create a new text file and name it with an accent, for example: é_ééc.txt.
4. Drag this file from Dolphin and drop it onto the file upload area in the browser.
5. Observe that Edge immediately crashes.

Expected Behavior:
The file should be accepted and added to the upload queue without the browser crashing.

Actual Behavior:
The browser window closes abruptly (crashes) the moment the file is dropped.

Additional Context:
The crash does not occur with Firefox.
The crash occurs even when running Edge from the terminal with flatpak run com.microsoft.Edge.
Setting the environment variable LANG=en_US.UTF-8 does not prevent the crash.
I have tested this with multiple files and different accents, and the crash is 100% reproducible.

[el-badr]

Update / Additional Testing:
I have now tested the official native .deb version of Microsoft Edge (installed from Microsoft's repository) on the same Kubuntu 25.1 system. With the native version, dragging a file containing accented characters (e.g., é_ééc.txt) into any upload field works perfectly, no crash occurs.

This confirms that the crash is specific to the Flatpak version of Edge. The native version handles UTF‑8 filenames correctly, so the issue likely lies in how the Flatpak sandbox handles file paths with non‑ASCII characters during drag‑and‑drop operations.

I have since switched to the native version, but I am reporting this to help improve the Flatpak package for other users.