[BUG][LINUX] Application uses XWayland instead of Wayland

[azuredusk10]

Checklist

• I have checked that this issue isn't addressed in the FAQ.
• I have checked that this issue isn't addressed in any other issue or pull request.
• I have tried setting my GPU ID.
• I am using Windows and I've tried common troubleshooting steps.

Describe the Bug

When I open the Upscayl app in Fedora 39, the UI is slightly blurry. It's still legibile and usable, but when I last used the app several months ago, this wasn't the case.

Display settings:

• Display scaling: 100%
• Resolution: 2256x1504
• Device: Framework 13
• Fractional scaling is NOT enabled in the GNOME experimental flags
• Font size adjusted in Tweaks to 0.90. However, the issue persists if the font size is reset to 1.0.

Could this be related to #76 ?

To Reproduce

• Open app version 2.9.5 in Fedora 39 on a high resolution display (e.g. a high DPI laptop screen or monitor)
• Look at the text and the UI elements. Notice that they have fuzzy outlines compared to other applications running.

Version (or commit hash)

2.9.5, Flatpak via Flathub

Select your Operating System

Linux

OS Version

Fedora 39 Workstation

GPU Name

Intel Iris - the integrated GPU of the Framework 13 12th gen Intel

Expected Behavior

UI elements appear sharp

Screenshots

Screenshot showing the app window next to the top bar for comparison of sharpness:

Paste the logs

⚙️ Getting saveImageAs from localStorage:  png
⚙️ Getting model from localStorage:  {"label":"General Photo (Ultrasharp)","value":"ultrasharp"}
⚙️ Setting gpuId to empty string
🔀 Setting model to 
🔀 Setting model to ultrasharp
🐞 BACKEND REPORTED:  💾 Updating Save Output Folder:  false
🐞 BACKEND REPORTED:  📝 Updating Overwrite:  false
⚙️ Getting saveImageAs from localStorage:  png
⚙️ Getting model from localStorage:  {"label":"General Photo (Ultrasharp)","value":"ultrasharp"}
⚙️ Setting gpuId to empty string
⚙️ Getting rememberOutputFolder from localStorage:  false
⚙️ Getting saveImageAs from localStorage:  png
⚙️ Getting model from localStorage:  {"label":"General Photo (Ultrasharp)","value":"ultrasharp"}
⚙️ Setting gpuId to empty string
🔀 Setting model to 
🔀 Setting model to ultrasharp
⚙️ Getting saveImageAs from localStorage:  png
⚙️ Getting model from localStorage:  {"label":"General Photo (Ultrasharp)","value":"ultrasharp"}
⚙️ Setting gpuId to empty string
⚙️ Getting rememberOutputFolder from localStorage:  false

[aaronliu0130]

Seems like an XWayland issue (see #591 for why we cant use Wayland RN)

[NayamAmarshe]

Is this fixed with Flatpak now?

[azuredusk10]

On version 2.9.8 from Flathub the app is still a bit blurry, no change

[NayamAmarshe]

On version 2.9.8 from Flathub the app is still a bit blurry, no change

We probably will need some help with the flatpak. I'm unfortunately unavailable for the time being.