Complete DEVICE_FEATURES to DeviceFeature transition for hidpp10 devices

Fixes solaar show.

Fixes: 378175f9 Remove NamedInts: Convert DeviceFeature to flag

lib/logitech_receiver/hidpp10_constants.py

@@ -220,6 +220,25 @@ class DeviceFeature(Flag):
     https://drive.google.com/file/d/0BxbRzx7vEV7eNDBheWY0UHM5dEU/view?usp=sharing
     """
 
+    @classmethod
+    def flag_names(cls, flag_bits: int) -> List[str]:
+        """Extract the names of the flags from the integer."""
+        indexed = {item.value: item.name for item in cls}
+
+        flag_names = []
+        unknown_bits = flag_bits
+        for k in indexed:
+            # Ensure that the key (flag value) is a power of 2 (a single bit flag)
+            assert bin(k).count("1") == 1
+            if k & flag_bits == k:
+                unknown_bits &= ~k
+                flag_names.append(indexed[k].replace("_", " ").lower())
+
+        # Yield any remaining unknown bits
+        if unknown_bits != 0:
+            flag_names.append(f"unknown:{unknown_bits:06X}")
+        return flag_names
+
     RESERVED1 = 0x010000
     SPECIAL_BUTTONS = 0x020000
     ENHANCED_KEY_USAGE = 0x040000

lib/solaar/cli/show.py

@@ -138,7 +138,7 @@ def _print_device(dev, num=None):
         device_features = _hidpp10.get_device_features(dev)
         if device_features is not None:
             if device_features:
-                device_features_names = hidpp10_constants.DEVICE_FEATURES.flag_names(device_features)
+                device_features_names = hidpp10_constants.DeviceFeature.flag_names(device_features)
                 print(f"     Features: {', '.join(device_features_names)} (0x{device_features:06X})")
             else:
                 print("     Features: (none)")