Even if I delete it, WebView (or other?) remains.

[tasuren]

Describe the bug
Let's say you have a program that creates a window to play videos.
And when I created multiple of them and then deleted some, the video in the browser that I had deleted would still be playing.

Steps To Reproduce
Prepare code of wry/examples/multi_window.rs.
Add a below snipet (YouTube embed) to here str.

<iframe class="background" id="background" 
src="https://www.youtube.com/embed/JUGHD_YWOe4?iv_load_policy=3&amp;loop=1&amp;playlist=JUGHD_YWOe4&amp;control=0&amp;fs=0&amp;mute=On&amp;end=111&amp;modestbranding=1&amp;start=11&amp;autoplay=1" 
frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; 
picture-in-picture" allowfullscreen="" style="width: 1191px; height: 678px;"></iframe>

Create about five windows every almost few seconds.
After a while, when it gets too noisy, close the window a little at a time and try to get only one.
Then it remains noisy.
So the closed window is still in motion.

Expected behavior
To be successfully closed.

Screenshots
Nothing

Platform and Versions (please complete the following information):
OS: macOS 12.3
Rustc: 1.59.0

Would you assign yourself to resolve this bug?

• Yes
• No

Additional context
Nothing

[keiya01]

This case seems to occur on MacOS 👀

[keiya01]

And I could reproduce this issue on MacOS.

[ahkohd]

Will this help? https://stackoverflow.com/questions/21161406/freeing-ios-uiwebview-resources-after-usage

-(void) dealloc
{

    [self.webview cleanForDealloc];
    self.webview = nil;
    [super dealloc];

}

[FabianLars]

I think it's this one: https://stackoverflow.com/questions/58454042/wkwebview-instances-and-memory-leak

I tried to test it, but i can't get obj-c to cooperate with me 😂

On that note i'm going to re-open this issue because we're leaking memory right now because of this.

[keiya01]

I try to fix this issue based on #536 (comment).
I would appreciate if you review #587 🙏

[keiya01]

Also maybe we need to remove WKWebsiteDataStore by using removeDataOfTypes.