Fix an issue when Accessibility enabled

Actually, it's not necessary to move our fragment upward, which contains
a list view.

mobile/src/main/java/com/github/shadowsocks/utils/Utils.kt

@@ -9,6 +9,7 @@ import android.support.annotation.AttrRes
 import android.support.v4.app.Fragment
 import android.support.v4.app.FragmentManager
 import android.support.v7.util.SortedList
+import android.view.accessibility.AccessibilityManager
 import android.util.TypedValue
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.JniHelper
@@ -21,6 +22,11 @@ private val fieldChildFragmentManager by lazy {
     field
 }
 
+fun isAccessibilityEnabled(context: Context): Boolean {
+    val am = context.getSystemService(Context.ACCESSIBILITY_SERVICE) as AccessibilityManager
+    return am.isEnabled()
+}
+
 fun String.isNumericAddress() = JniHelper.parseNumericAddress(this) != null
 fun String.parseNumericAddress(): InetAddress? {
     val addr = JniHelper.parseNumericAddress(this)