Redraw brightness slider on density change.

Without this, the drawable we use for the brightness slider gets
drawn at the wrong size whenever the screen density changes. This
also appears to ensure that the brightness icon gets drawn in the
correct color.

Fixes: 191738397
Test: manual
Change-Id: I21929985935299e14043482dd0496684642e5004

packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessSliderView.java

@@ -180,6 +180,8 @@ public class BrightnessSliderView extends FrameLayout {
      * Sets the scale for the progress bar (for brightness_progress_drawable.xml)
      *
      * This will only scale the thick progress bar and not the icon inside
+     *
+     * Used in {@link com.android.systemui.qs.QSAnimator}.
      */
     public void setSliderScaleY(float scale) {
         if (scale != mScale) {

packages/SystemUI/src/com/android/systemui/util/RoundedCornerProgressDrawable.kt

@@ -16,6 +16,7 @@
 
 package com.android.systemui.util
 
+import android.content.pm.ActivityInfo
 import android.content.res.Resources
 import android.graphics.Rect
 import android.graphics.drawable.Drawable
@@ -64,6 +65,10 @@ class RoundedCornerProgressDrawable @JvmOverloads constructor(
         return RoundedCornerState(super.getConstantState()!!)
     }
 
+    override fun getChangingConfigurations(): Int {
+        return super.getChangingConfigurations() or ActivityInfo.CONFIG_DENSITY
+    }
+
     private class RoundedCornerState(private val wrappedState: ConstantState) : ConstantState() {
         override fun newDrawable(): Drawable {
             return newDrawable(null, null)