Javascript console in remote debugging session does not work with Qt WebEngine

Summary
When trying to use the remote debugging for a Qt WebEngine-based application, the javascript console does not react to commands given. Pressing <Enter> simply creates a newline, but does not execute the given command (see the attached screenshot).

Steps to reproduce

• Start the demobrowser example with the commandline parameter --remote-debugging-port=1234.
• Connect to the debugging session in the browser with URL http://localhost:1234.
• Execute a command in the javascript console.

Expected behavior

• The command is executed.

Actual behavior

• The command is ignored.
• The cursor changes to the next line.