Implement a Fluent Design 2 (WinUI3) GUI.

[RokeJulianLockhart]

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Feature request

Which Nextcloud Version are you currently using:

I believe that I am unable to access this information.

Is your feature request related to a problem? Please describe.

WinUI versions 2 and 3 are the sole currently Microsoft-endorsed GUI toolkits for Windows applications. This matters, because like how on AOSP, any application targeting API Level >31 is expected, by the userbase, to adhere to Material 3 design guidelines (the application style standard) and support Material You (the user-defined colouration customisation standard), Windows 11 users expect (Version >1 of) WinUI.

Currently, NextCloud does not do so:

Describe the solution you'd like

Convert your GUI markup (or code, if it's inline — I'm unfamiliar with this codebase) to Version >1 of WinUI.

Describe alternatives you've considered

Somehow implement the Fluent Design application style guidelines without doing so. This seems like a lot more work for no gain, though.

Additional context

OneDrive has done so:

Alternative examples of well-designed FD applications are:

1. simon-knuth/scanner:

   

2. bloxstraplabs/bloxstrap:

   

[mgallien]

we currently are working on the switch to a Fluent Windows style (native Windows 11 style from Microsoft).
see #7416
any bigger redesign of the settings dialog would take longer

[RokeJulianLockhart]

#7738 (comment)

@mgallien, that is a significant improvement. If Qt is actually able to provide a compliant application style, then perhaps that is the solution. I'm rather surprised that they've bothered to.