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Currently, each JShell instance starts with lots of text and the prompt starts with [9]. The text should be removed or hidden or in a code fold and the prompt should start at the top of the shell with [1].
Moving to an appropriate component
Instead of removing, I've implemented a simple folding. Now it is possible to configure the IDE to autofold the entire initial greeting (the message with system version, classpath info etc) or specifically the classpath items (Classpath). Implemented in rev jet-main#f5fd1f494cc8