Text longer than 2048 characters truncated when copied from collapsed message

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

Bug description

On Signal Android when copying collapsed long message (>2048 characters) from message thread, text gets cut to first 2048 characters. It's consistent behavior and works that way every time. I suspect it's restriction from time when max Signal message length was 2000 characters that weren't removed.

When copying expanded long message in Read more view through Select all>Copy, all the message text is copied.

This can potentially occur on Signal iOS too but I can't confirm this since I haven't iPhone.

Steps to reproduce

• Receive/send very long message (about 3000 characters).
• Select collapsed message and copy .
• Paste it somewhere.

Actual result:
Pasted text is only 2048 characters long. The rest of copied message is missing.

Expected result:
Entire message text is copied and pasted.

Device info

Device: LG G4
Android version: 6
Signal version: 4.58.1

Start by reproducing this on Signal Android with a message of about 3000 characters: copy it while collapsed, then paste it elsewhere and compare the result with copying it from the expanded Read more view. No source file or test is named; done means the collapsed-message copy contains the entire message rather than stopping at 2048 characters.