[Linux/Wayland] `setMinimumSize()` / `setMaximumSize()` / `setAlwaysOnTop()` not working

[Mairon1206]

The setMinimumSize(), setMaximumSize(), and setAlwaysOnTop() methods from window_manager appear to have no effect when running under KDE Plasma with Wayland. However, the same functionality works correctly when implementing equivalent GTK logic directly in native C++ code in linux/runner/my_application.cc.

Environment:

• OS: Arch Linux
• Desktop Environment: KDE Plasma
• Display Server: Wayland
• Flutter Version: 3.29.2

( I haven't tested this in other Desktop Environment like GNOME, but it seems irrelavant with that.