[Slider][A11y] Set a minimum accessibility touch target size of 48dp for Voice Access

This resolves an issue where Voice Access could not detect or interact with the slider when the minTouchTargetSize attribute was set to 0dp in theme.

PiperOrigin-RevId: 888060511

Author: Material Design Team

lib/java/com/google/android/material/slider/BaseSlider.java

@@ -329,6 +329,7 @@ abstract class BaseSlider<
   private int minTickSpacing;
 
   @Px private int minTouchTargetSize;
+  @Px private int accessibilityMinTouchTargetSize;
 
   @Orientation private int widgetOrientation;
   private int minWidgetThickness;
@@ -536,6 +537,9 @@ private void loadResources(@NonNull Resources resources) {
     labelPadding = resources.getDimensionPixelSize(R.dimen.mtrl_slider_label_padding);
 
     trackIconPadding = resources.getDimensionPixelOffset(R.dimen.m3_slider_track_icon_padding);
+
+    accessibilityMinTouchTargetSize =
+        resources.getDimensionPixelSize(R.dimen.mtrl_min_touch_target_size);
   }
 
   private void processAttributes(Context context, AttributeSet attrs, int defStyleAttr) {
@@ -4243,8 +4247,12 @@ public void writeToParcel(@NonNull Parcel dest, int flags) {
   void updateBoundsForVirtualViewId(int virtualViewId, Rect virtualViewBounds) {
     int x = trackSidePadding + (int) (normalizeValue(getValues().get(virtualViewId)) * trackWidth);
     int y = calculateTrackCenter();
-    int touchTargetOffsetX = max(thumbWidth / 2, minTouchTargetSize / 2);
-    int touchTargetOffsetY = max(thumbHeight / 2, minTouchTargetSize / 2);
+
+    int targetSize = max(minTouchTargetSize, accessibilityMinTouchTargetSize);
+
+    int touchTargetOffsetX = max(thumbWidth / 2, targetSize / 2);
+    int touchTargetOffsetY = max(thumbHeight / 2, targetSize / 2);
+
     RectF rect =
         new RectF(
             x - touchTargetOffsetX,