TransactionTooLargeException when replying to message with large body

[Sami32]

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App version

6.800

Where did you get the app from?

Other

Android version

7.0 MIUI 11

Device model

Xiaomi Redmi Note 4

Steps to reproduce

1. Answer an encrypted email
2. Select to attach a document
3. Crash happen

Expected behavior

No crashes like before.

Actual behavior

Crashes when answering an encrypted email.

Logs

k9mail-logs.txt

[cketti]

Stack trace from the log:

java.lang.RuntimeException: android.os.TransactionTooLargeException: data parcel size 898364 bytes
	at android.app.ActivityThread$StopInfo.run(ActivityThread.java:3873)
	at android.os.Handler.handleCallback(Handler.java:754)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:165)
	at android.app.ActivityThread.main(ActivityThread.java:6375)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:802)
Caused by: android.os.TransactionTooLargeException: data parcel size 898364 bytes
	at android.os.BinderProxy.transactNative(Native Method)
	at android.os.BinderProxy.transact(Binder.java:622)
	at android.app.ActivityManagerProxy.activityStopped(ActivityManagerNative.java:3688)
	at android.app.ActivityThread$StopInfo.run(ActivityThread.java:3865)
	... 7 more

This is unlikely to be a new bug. It's probably caused by a text field with too much data for the saved instance state mechanism. Fixing this requires changing how we save state in the compose screen.