Refactored to do everything based on LEDs.

This will adapt the devices and reduces the importance of the "special case keyboard"

Groups/Extensions/LedGroupExtension.cs

@@ -0,0 +1,79 @@
+// ReSharper disable MemberCanBePrivate.Global
+// ReSharper disable UnusedMember.Global
+
+using CUE.NET.Devices.Generic;
+using CUE.NET.Devices.Generic.Enums;
+
+namespace CUE.NET.Groups.Extensions
+{
+    /// <summary>
+    /// Offers some extensions and helper-methods for ledgroup related things.
+    /// </summary>
+    public static class LedGroupExtension
+    {
+        /// <summary>
+        /// Converts the given <see cref="AbstractLedGroup" /> to a <see cref="ListLedGroup" />.
+        /// </summary>
+        /// <param name="ledGroup">The <see cref="AbstractLedGroup" /> to convert.</param>
+        /// <returns>The converted <see cref="ListLedGroup" />.</returns>
+        public static ListLedGroup ToSimpleKeyGroup(this AbstractLedGroup ledGroup)
+        {
+            ListLedGroup simpleLedGroup = ledGroup as ListLedGroup;
+            if (simpleLedGroup == null)
+            {
+                bool wasAttached = ledGroup.Detach();
+                simpleLedGroup = new ListLedGroup(ledGroup.Device, wasAttached, ledGroup.GetLeds()) { Brush = ledGroup.Brush };
+            }
+            return simpleLedGroup;
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="ListLedGroup" /> which contains all LEDs from the given ledgroup excluding the specified ones.
+        /// </summary>
+        /// <param name="ledGroup">The base ledgroup.</param>
+        /// <param name="ledIds">The ids of the LEDs to exclude.</param>
+        /// <returns>The new <see cref="ListLedGroup" />.</returns>
+        public static ListLedGroup Exclude(this AbstractLedGroup ledGroup, params CorsairLedId[] ledIds)
+        {
+            ListLedGroup simpleLedGroup = ledGroup.ToSimpleKeyGroup();
+            foreach (CorsairLedId ledId in ledIds)
+                simpleLedGroup.RemoveLed(ledId);
+            return simpleLedGroup;
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="ListLedGroup" /> which contains all LEDs from the given ledgroup excluding the specified ones.
+        /// </summary>
+        /// <param name="ledGroup">The base ledgroup.</param>
+        /// <param name="ledIds">The LEDs to exclude.</param>
+        /// <returns>The new <see cref="ListLedGroup" />.</returns>
+        public static ListLedGroup Exclude(this AbstractLedGroup ledGroup, params CorsairLed[] ledIds)
+        {
+            ListLedGroup simpleLedGroup = ledGroup.ToSimpleKeyGroup();
+            foreach (CorsairLed led in ledIds)
+                simpleLedGroup.RemoveLed(led);
+            return simpleLedGroup;
+        }
+
+        // ReSharper disable once UnusedMethodReturnValue.Global
+        /// <summary>
+        /// Attaches the given ledgroup to the device.
+        /// </summary>
+        /// <param name="ledGroup">The ledgroup to attach.</param>
+        /// <returns><c>true</c> if the ledgroup could be attached; otherwise, <c>false</c>.</returns>
+        public static bool Attach(this AbstractLedGroup ledGroup)
+        {
+            return ledGroup.Device?.AttachLedGroup(ledGroup) ?? false;
+        }
+
+        /// <summary>
+        /// Detaches the given ledgroup from the device.
+        /// </summary>
+        /// <param name="ledGroup">The ledgroup to attach.</param>
+        /// <returns><c>true</c> if the ledgroup could be detached; otherwise, <c>false</c>.</returns>
+        public static bool Detach(this AbstractLedGroup ledGroup)
+        {
+            return ledGroup.Device?.DetachLedGroup(ledGroup) ?? false;
+        }
+    }
+}