guess default mMaxHeight but allow layout to override this.

without this code, progress bar height gets smaller when thumb gets bigger
in AbsSeekBar.java onSizeChanged().

Author: NoraBora

core/java/android/widget/ProgressBar.java

@@ -177,6 +177,7 @@ public ProgressBar(Context context, AttributeSet attrs, int defStyle) {
         Drawable drawable = a.getDrawable(R.styleable.ProgressBar_progressDrawable);
         if (drawable != null) {
             drawable = tileify(drawable, false);
+            // guess mMaxHeight. but allow XML layout to override this.
             setProgressDrawable(drawable);
         }
 
@@ -421,6 +422,13 @@ public Drawable getProgressDrawable() {
     public void setProgressDrawable(Drawable d) {
         if (d != null) {
             d.setCallback(this);
+
+            // without this code, progress bar height will be updated.
+            int drawableHeight = drawable.getMinimumHeight();
+            if (mMaxHeight < drawableHeight) {
+                mMaxHeight = drawableHeight;
+                requestLayout();
+            }
         }
         mProgressDrawable = d;
         if (!mIndeterminate) {