[Fix] Use AppCompatTextView instead of TextView.

Author: zhanghai

library/src/main/java/me/zhanghai/android/fastscroll/FastScroller.java

@@ -33,6 +33,7 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.widget.AppCompatTextView;
 import androidx.core.math.MathUtils;
 import androidx.core.util.Consumer;
 
@@ -100,7 +101,7 @@ public FastScroller(@NonNull ViewGroup view, @NonNull ViewHelper viewHelper,
         mTrackView.setBackground(trackDrawable);
         mThumbView = new View(context);
         mThumbView.setBackground(thumbDrawable);
-        mPopupView = new TextView(context);
+        mPopupView = new AppCompatTextView(context);
         mPopupView.setLayoutParams(new FrameLayout.LayoutParams(
                 ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
         popupStyle.accept(mPopupView);