[Bug] Exclamation mark commands incorrectly parse subsequent input as continuation

Bug Description
If you run a command that starts with an exclamation mark, and while it is running, you provide some additional guidance (You're not running a command in the second case.)

It tries to run the guidance as the command like it's a continuation of the exclamation mark. This is a regression; it didn't use to do that.

! sleep 30 
  ⎿  Running… (3s)
     ctrl+b to run in background


  hello

becomes

! sleep 30 
  ⎿  (No content)

! hello 
  ⎿  /bin/bash: line 1: hello: command not found

needs to be

! sleep 30 
  ⎿  (No content)

> hello 
...

Environment Info

• Platform: linux
• Terminal: vte-based
• Version: 2.0.25
• Feedback ID: 3072462f-fcb4-4f46-b675-32ede135a1d8

Errors

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