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Start IRB. Type in 'true<CR>' -> have to wait 5s for being able to enter next command. Seems to be caused by: 1) #faf7cc311d8d - but revert did not help too much -> you have to wait one second. And cannot simply revert, since you likely had a reason for the change 2) #dc476068671e - which seems to be main culprit. Reverting it helps. Sure, can't for same reasons.
This might be observed also when running some script. Script is run, outputs all its result into OW, then there is 5s 'silence', then script finished from the user's point of view (watch OW rerun/stop button). Tweaking subject. Not just-IRB related.
Should be fixed now, #bebaf809f50f.
Integrated into 'main-golden', available in build *200808220201* on http://bits.netbeans.org/dev/nightly/ Changeset: http://hg.netbeans.org/main/rev/bebaf809f50f User: Erno Mononen <emononen@netbeans.org> Log: #144323: Poor I/O responsiveness within OW