Disable "Stay on Top" setting of IToolFormAutoConfigs on Unix

src/BizHawk.Client.EmuHawk/tools/ToolManager.cs

@@ -224,12 +224,21 @@ public void AutoLoad()
 		private void RefreshSettings(Form form, ToolStripItemCollection menu, ToolDialogSettings settings, int idx)
 		{
 			((ToolStripMenuItem)menu[idx + 0]).Checked = settings.SaveWindowPosition;
-			((ToolStripMenuItem)menu[idx + 1]).Checked = settings.TopMost;
+			var stayOnTopItem = (ToolStripMenuItem)menu[idx + 1];
+			stayOnTopItem.Checked = settings.TopMost;
+			if (OSTailoredCode.IsUnixHost)
+			{
+				// This is the job of the WM, and is usually exposed in window decorations or a context menu on them
+				stayOnTopItem.Enabled = false;
+				stayOnTopItem.Visible = false;
+			}
+			else
+			{
+				form.TopMost = settings.TopMost;
+			}
 			((ToolStripMenuItem)menu[idx + 2]).Checked = settings.FloatingWindow;
 			((ToolStripMenuItem)menu[idx + 3]).Checked = settings.AutoLoad;
 
-			form.TopMost = settings.TopMost;
-
 			// do we need to do this OnShown() as well?
 			form.Owner = settings.FloatingWindow ? null : _owner;
 		}