Fix #660. Update subsampling

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderCustomFilterDialog.kt

@@ -96,6 +96,7 @@ class ReaderCustomFilterDialog : DialogFragment() {
 
         // Set brightness value
         txt_brightness_seekbar_value.text = brightness.toString()
+        brightness_seekbar.progress = brightness
 
         // Initialize seekBar progress
         seekbar_color_filter_alpha.progress = argb[0]
@@ -145,7 +146,7 @@ class ReaderCustomFilterDialog : DialogFragment() {
                 }
             }
         })
-        brightness_seekbar.progress = preferences.customBrightnessValue().getOrDefault()
+
         brightness_seekbar.setOnSeekBarChangeListener(object : SimpleSeekBarListener() {
             override fun onProgressChanged(seekBar: SeekBar, value: Int, fromUser: Boolean) {
                 if (fromUser) {

app/src/main/java/eu/kanade/tachiyomi/widget/NegativeSeekBar.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.widget
 
 import android.content.Context
+import android.os.Parcelable
 import android.util.AttributeSet
 import android.widget.SeekBar
 import eu.kanade.tachiyomi.R
@@ -58,4 +59,11 @@ class NegativeSeekBar @JvmOverloads constructor(context: Context, attrs: Attribu
         this.listener = listener
     }
 
+    override fun onRestoreInstanceState(state: Parcelable?) {
+        // We can't restore the progress from the saved state because it gets shifted.
+        val origProgress = progress
+        super.onRestoreInstanceState(state)
+        super.setProgress(origProgress)
+    }
+
 }