Crash when returning to upload file dialog

[AnrDaemon]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

Have Nextcloud application open with "upload files" file picker screen active.
Let application go to sleep (run 2-3 heavy apps, like bank apps), then return to NextCloud app.

Expected behaviour

No crash at the very least.

Actual behaviour

Cause of error

Exception in thread "main" java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nextcloud.client/com.owncloud.android.ui.activity.FileDisplayActivity}: java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.util.Stack
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3640)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3797)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2215)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:346)
    at android.os.Looper.loop(Looper.java:475)
    at android.app.ActivityThread.main(ActivityThread.java:7889)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009)
Caused by: Exception in thread "main" java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.util.Stack
    at com.owncloud.android.ui.activity.FileDisplayActivity.loadSavedInstanceState(FileDisplayActivity.java:296)
    at com.owncloud.android.ui.activity.FileDisplayActivity.onCreate(FileDisplayActivity.java:269)
    at android.app.Activity.performCreate(Activity.java:8050)
    at android.app.Activity.performCreate(Activity.java:8030)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1330)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3613)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3797)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2215)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:346)
    at android.os.Looper.loop(Looper.java:475)
    at android.app.ActivityThread.main(ActivityThread.java:7889)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009)

App information

• ID: com.nextcloud.client
• Version: 30280090
• Build flavor: gplay

Device information

• Brand: Sony
• Device: XQ-AU52
• Model: XQ-AU52
• Id: 59.2.A.0.463
• Product: XQ-AU52

Firmware

• SDK: 31
• Release: 12
• Incremental: 059002A000046302402528438

Android version

12

Device brand and model

Sony Xperia 10 II (XQ-AU52)

Stock or custom OS?

Stock

Nextcloud android app version

3.28.0

Nextcloud server version

Not relevant

Using a reverse proxy?

I don't know

Android logs

No response

Server error logs

No response

Additional information

No response

[Unpublished]

Dupe of #12528