b/2137747 Fixed the problem where BT is stuck grayed out if you turned off BT, turned on Airplane mode, turn off then on screen, turned off Airplane mode.

Change-Id: I37c628e4a98157ed91d519518773a458dca36c00

src/com/android/settings/bluetooth/BluetoothEnabler.java

@@ -116,7 +116,15 @@ public class BluetoothEnabler implements Preference.OnPreferenceChangeListener {
                                            mOriginalSummary :
                                            null);
 
-            mCheckBoxPreference.setEnabled(isEnabledByDependency());
+            /*
+             * Don't ever disable the preference. Only enable here. Disablement
+             * is taken care of by the dependency code. If this is disabled
+             * here, it may not be re-enabled from the framework when dependency
+             * is met. http://b/issue?id=2053751
+             */
+            if (isEnabledByDependency()) {
+                mCheckBoxPreference.setEnabled(true);
+            }
             
         } else if (state == BluetoothAdapter.STATE_TURNING_ON ||
                 state == BluetoothAdapter.STATE_TURNING_OFF) {