Merge "Fix the display/Font preview window appears blank while transitioning between sizes."

                    final ProgressInteractionListener interactionListener =

                            mInteractionListener.get();

                    interactionListener.notifyPreferenceChanged();

                    // Avoid timing issues to update the corresponding preview fail when clicking

                    // the increase/decrease button.

                    seekBar.post(interactionListener::notifyPreferenceChanged);

                    if (!mSeekByTouch) {

                        interactionListener.onProgressChanged();

import static org.mockito.Mockito.when;

import android.content.Context;

import android.widget.SeekBar;

import androidx.preference.PreferenceScreen;

import androidx.test.core.app.ApplicationProvider;

        verify(mInteractionListener).onProgressChanged();

    }

    @Test

    public void onProgressChanged_verifyNotifyPreferenceChanged() {

        mSeekBarController.displayPreference(mPreferenceScreen);

        mSeekBarPreference.setProgress(mSeekBarPreference.getMax());

        mSeekBarPreference.onProgressChanged(new SeekBar(mContext), /* progress= */

                0, /* fromUser= */ false);

        verify(mInteractionListener).notifyPreferenceChanged();

    }

}