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For the j2ee 1.4 app server, the configuration editor (created by j2eeserver module) has a tree on the left and customizers on the right side. After one move (left or right) of the vertical separator between the tree and the customizers, it is impossible to move it any more.
Looks like an issue with the common editor framework.
I cannot reproduce the issue. Neither on Tomcat nor on S1 Appl Server. Please, confirm whether the issue can be closed. If not, send a build number or attach a web module that caused the issue.
CNR: you can close
The submitter can't reproduce as well.