add predefined image clipboard formats because GetClipboardFormatName cannot get a name for predefined. The Unknown_Format_ template is poor for system formats

src/Windows/Avalonia.Win32/ClipboardFormats.cs

@@ -33,6 +33,13 @@ namespace Avalonia.Win32
 #pragma warning disable CS0618 // Type or member is obsolete
             new ClipboardFormat(DataFormats.FileNames, (ushort)UnmanagedMethods.ClipboardFormat.CF_HDROP),
 #pragma warning restore CS0618 // Type or member is obsolete
+
+            new ClipboardFormat("Bitmap", (ushort)UnmanagedMethods.ClipboardFormat.CF_BITMAP),
+            new ClipboardFormat("MetafilePict", (ushort)UnmanagedMethods.ClipboardFormat.CF_METAFILEPICT),
+            new ClipboardFormat("Dib", (ushort)UnmanagedMethods.ClipboardFormat.CF_DIB),
+            new ClipboardFormat("EnhancedMetafile", (ushort)UnmanagedMethods.ClipboardFormat.CF_ENHMETAFILE),
+            new ClipboardFormat("Palette", (ushort)UnmanagedMethods.ClipboardFormat.CF_PALETTE),
+            new ClipboardFormat("PenData", (ushort)UnmanagedMethods.ClipboardFormat.CF_PENDATA),
         };
 
 

src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs

@@ -2135,14 +2135,30 @@ namespace Avalonia.Win32.Interop
             /// </summary>
             CF_BITMAP = 2,
             /// <summary>
+            /// Handle to a metafile picture format as defined by the METAFILEPICT structure. When passing a CF_METAFILEPICT handle by means of DDE, the application responsible for deleting hMem should also free the metafile referred to by the CF_METAFILEPICT handle.
+            /// </summary>
+            CF_METAFILEPICT = 3,
+            /// <summary>
             /// A memory object containing a BITMAPINFO structure followed by the bitmap bits.
             /// </summary>
             CF_DIB = 8,
             /// <summary>
+            /// Handle to a color palette.
+            /// </summary>
+            CF_PALETTE = 9,
+            /// <summary>
+            /// Data for the pen extensions to the Microsoft Windows for Pen Computing.
+            /// </summary>
+            CF_PENDATA = 10,
+            /// <summary>
             /// Unicode text format. Each line ends with a carriage return/linefeed (CR-LF) combination. A null character signals the end of the data.
             /// </summary>
             CF_UNICODETEXT = 13,
             /// <summary>
+            /// A handle to an enhanced metafile (HENHMETAFILE).
+            /// </summary>
+            CF_ENHMETAFILE = 14,
+            /// <summary>
             /// A handle to type HDROP that identifies a list of files. 
             /// </summary>
             CF_HDROP = 15,