Caption can not turn off at iOS Safari

[cuyl]

Have you read the FAQ and checked for duplicate open issues?
Yes

What version of Shaka Player are you using?
4.3.3

Can you reproduce the issue with our latest release version?
yes

Can you reproduce the issue with the latest code from main?
yes

Are you using the demo app or your own custom app?

https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/angel-one-hls/hls.m3u8;panel=ALL_CONTENT;panelData=HLS,SUBTITLES;build=uncompiled

What browser and OS are you using?

iOS Safari

For embedded devices (smart TVs, etc.), what model and firmware version are you using?

What are the manifest and license server URIs?

What configuration are you using? What is the output of player.getConfiguration()?
autoShowText: ' ALWAYS'

What did you do?
Open a HLS with Subtitles in iOS safari browser.
When the Caption turned on initially it can not turn off.
After switch to another language, it can be turn off.

What did you expect to happen?
Caption can turn off.

What actually happened?

I found that player.setTextTrackVisibility(false) is not working in this case.
player.isTextVisible_ is false but it should be true.

shaka-player/lib/player.js

Lines 4429 to 4436 in 67a2451

	setTextTrackVisibility(isVisible) {
	const oldVisibilty = this.isTextVisible_;
	// Convert to boolean in case apps pass 0/1 instead false/true.
	const newVisibility = !!isVisible;
	if (oldVisibilty == newVisibility) {
	return;
	}