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This issue was reported manually by jstola. It already has 2 duplicates Build: NetBeans IDE Dev (Build 20111009-a9e7469407ae) VM: Java HotSpot(TM) Client VM, 20.2-b06, Java(TM) SE Runtime Environment, 1.6.0_27-b07 OS: Windows 7 Stacktrace: java.lang.AssertionError at org.netbeans.modules.form.layoutdesign.LayoutFeeder.addToGroup(LayoutFeeder.java:1899) at org.netbeans.modules.form.layoutdesign.LayoutFeeder.addInterval(LayoutFeeder.java:1796) at org.netbeans.modules.form.layoutdesign.LayoutFeeder.add(LayoutFeeder.java:532) at org.netbeans.modules.form.layoutdesign.LayoutDesigner.addComponents(LayoutDesigner.java:1244) at org.netbeans.modules.form.layoutdesign.LayoutDesigner.endMoving(LayoutDesigner.java:1156) at org.netbeans.modules.form.HandleLayer$ResizeComponentDrag.end(HandleLayer.java:2887)
Created attachment 112003 [details] stacktrace
This test-case was originally attached to issue 193592. Steps to reproduce: 1. Open the attached project. 2. Open NewJFrame.java. 3. Drag the top edge of jButton3 and drop it such that it aligns with the top edge of jButon2. => the exception is thrown.
Created attachment 112005 [details] Project exhibiting the problem.
Fixed. http://hg.netbeans.org/jet-main/rev/5015e6b90a1c
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/5015e6b90a1c User: Tomas Pavek <tpavek@netbeans.org> Log: #193592, #203656, and some more tweaks