[Bug] IllegalStateException: window count is over max!!

https://ankidroid.org/acra/app/1/bug/132331/report/268484d3-3378-44a2-a3c5-59ceac0d7a09

```
java.lang.IllegalStateException: window count is over max!!
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:450)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
at android.app.Dialog.show(Dialog.java:521)
at androidx.appcompat.app.AlertDialog$Builder.show(SourceFile:5)
at com.ichi2.anki.pages.PageChromeClient.onJsAlert(SourceFile:51)
at WV.z6.run(chromium-TrichromeWebViewGoogle6432.aab-stable-616717833:138)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8762)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
```

Note:

```
at androidx.appcompat.app.AlertDialog$Builder.show(SourceFile:5)
at com.ichi2.anki.pages.PageChromeClient.onJsAlert(SourceFile:51)
```

Seen a couple of times in ACRA. Needs reproduction steps