Copying very large bodies of text causes keyboard to hang due to clipboard preview

[thedustinmiller]

Describe the bug
After copying large bodies of text, the keyboard will take several seconds, depending on text size, to pop up when opening the keyboard in any app. It will eventually appear, but nothing happens in the meantime.

Even though that is a lot of text, the Samsung stock keyboard appears and shows a preview instantly and the text can be pasted into other apps near instantly. The use case I discovered this through was copying large texts into LLMs to generate summaries.

To Reproduce
Bodies of text larger than 100kb seem to reliably trigger this. Going to Project Gutenberg, finding a book with UTF8 size greater than 100kb, and copying the entire raw utf8 format is an easy method and causes a 5-10 second hang (dependent on copied text size; it becomes noticeable, around 0.5-1 second, around 1-10kb). I think it's the clipboard preview, since clearing the history resolves it temporarily and disabling both clipboard history and clipboard suggestions prevents the issue entirely.

Expected behavior
Keyboard should pop up as quickly as normal while showing a short preview of clipboard contents (if enabled)

App version
2.2
Device:

• Model: Samsung S23 Ultra and Samsung Zfold 6
• OS: Android 14 One UI 6.1