Topmost Window property not respected on Gtk

[jonko0493]

Expected Behavior

When applying the Topmost property to a Form or using the FloatingForm class, that window should stay on top of all other windows (Topmost) or application windows (FloatingForm).

Actual Behavior

Neither of these happen. Selecting the main window causes it to go in front of the window marked Topmost.

Steps to Reproduce the Problem

1. Create an Eto project with Gtk bindings.
2. Create a new Form & set Topmost to true or just create a FloatingForm from within your MainForm class and call .Show().
3. Run the program and observe that it works as expected on Windows & Mac but fails on Linux.

Code that Demonstrates the Problem

N/A, really, I was just using the FloatingForm class. This is the PR where I noticed the problem.

Specifications

• Version: 2.7.5
• Platform(s): Gtk affected, works on WPF and Mac
• Operating System(s): Tested on Ubuntu 22.04

[cwensley]

Eto simply sets GTK's KeepAbove property. If it isn't working, then it is your window manager ignoring it. If you are using Wayland, it does not support topmost windows.

[jonko0493]

Got it. Thanks for your help as usual!