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Start ide (I was using build #20010912). Open output window if it isn't opened. Note that explorer is dominant. Restart ide. Now outputwindow is dominant. Select explorer and go to the Window | Make Dominant. Attached exception will be thrown.
Created attachment 2508 [details] the exception
Yes, caused by the fact that output refuses to be serialized and uses "writeReplace to null" technique, which now can't be used. Solution will be to add some support into TopComponent, which will say if component wants to be serialized at all and how.
*** Issue 15553 has been marked as a duplicate of this issue. ***
CC'ing myself
fixed in main trunk. Will be visible in tomorrow's build.
dev#20010920
Resolved for 3.4.x or earlier, no new info since then -> closing.