Fixes for taskbar app

Interop/X11.cs

@@ -88,6 +88,9 @@ internal static partial class X11
     [LibraryImport(LibX11, StringMarshalling = StringMarshalling.Utf8)]
     public static partial int XStoreName(IntPtr display, IntPtr window, string windowName);
 
+    [LibraryImport(LibX11)]
+    public static partial int XSetClassHint(IntPtr display, IntPtr window, ref XClassHint classHint);
+
     [LibraryImport(LibX11)]
     public static partial int XRaiseWindow(IntPtr display, IntPtr window);
 

Interop/XClassHint.cs

@@ -0,0 +1,13 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
+
+namespace Microsoft.Maui.Platform.Linux.Interop;
+
+[StructLayout(LayoutKind.Sequential)]
+public struct XClassHint
+{
+    public IntPtr res_name;
+    public IntPtr res_class;
+}

LinuxApplication.cs

@@ -265,6 +265,18 @@ public class LinuxApplication : IDisposable
             Console.WriteLine("[LinuxApplication] GTK pre-initialized for WebView support");
         }
 
+        // Set application name for desktop integration (taskbar, etc.)
+        // Try to get the name from environment or use executable name
+        string? appName = Environment.GetEnvironmentVariable("APPIMAGE_NAME");
+        if (string.IsNullOrEmpty(appName))
+        {
+            appName = Path.GetFileNameWithoutExtension(Environment.ProcessPath ?? "MauiApp");
+        }
+        string prgName = appName.Replace(" ", "");
+        GtkNative.g_set_prgname(prgName);
+        GtkNative.g_set_application_name(appName);
+        Console.WriteLine($"[LinuxApplication] Set application name: {appName} (prgname: {prgName})");
+
         // Initialize dispatcher
         LinuxDispatcher.Initialize();
         DispatcherProvider.SetCurrent(LinuxDispatcherProvider.Instance);

Native/GtkNative.cs

@@ -42,6 +42,12 @@ internal static class GtkNative
     [DllImport("libgtk-3.so.0")]
     public static extern void gtk_window_set_title(IntPtr window, string title);
 
+    [DllImport("libglib-2.0.so.0")]
+    public static extern void g_set_prgname(string name);
+
+    [DllImport("libglib-2.0.so.0")]
+    public static extern void g_set_application_name(string name);
+
     [DllImport("libgtk-3.so.0")]
     public static extern void gtk_window_set_default_size(IntPtr window, int width, int height);
 

Window/X11Window.cs

@@ -150,6 +150,9 @@ public class X11Window : IDisposable
         // Set window title
         X11.XStoreName(_display, _window, title);
 
+        // Set WM_CLASS for desktop integration (taskbar icon matching)
+        SetWMClass(title.Replace(" ", ""), title.Replace(" ", ""));
+
         // Select input events
         X11.XSelectInput(_display, _window,
             XEventMask.KeyPressMask |
@@ -196,6 +199,37 @@ public class X11Window : IDisposable
         }
     }
 
+    /// <summary>
+    /// Sets the WM_CLASS property for desktop integration.
+    /// This allows the desktop to match the window to its .desktop file.
+    /// </summary>
+    public void SetWMClass(string resName, string resClass)
+    {
+        IntPtr namePtr = IntPtr.Zero;
+        IntPtr classPtr = IntPtr.Zero;
+        try
+        {
+            namePtr = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(resName);
+            classPtr = System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(resClass);
+
+            var classHint = new XClassHint
+            {
+                res_name = namePtr,
+                res_class = classPtr
+            };
+
+            X11.XSetClassHint(_display, _window, ref classHint);
+            Console.WriteLine($"[X11Window] Set WM_CLASS: {resName}, {resClass}");
+        }
+        finally
+        {
+            if (namePtr != IntPtr.Zero)
+                System.Runtime.InteropServices.Marshal.FreeHGlobal(namePtr);
+            if (classPtr != IntPtr.Zero)
+                System.Runtime.InteropServices.Marshal.FreeHGlobal(classPtr);
+        }
+    }
+
     /// <summary>
     /// Sets the window icon from a file. Supports both raster images and SVG.
     /// </summary>