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There is necessary to write tests for window components (especially for containers in windows/frames package), ensuring they are manipulated from AWT thread only. (See issues #21921, #21946). The scenario how to write such test: 1) Subclass tested GUI component (e.g. SplitContainerImpl), 2) Override all its protected and public methods the way it asserts it is in AWT thread, and then calls the superclass method. 3) Manage to replace the above class the default one 4) try some operation in IDE (start, switching workspaces, projects etc.)
Target milestone was changed from '3.4' to TBD.
Because Window System v1 will not be supported from now by our team, all old winsys issues (now "core/window system v1" issues) are going to be closed as WONTFIX. Changes in API which emerged both from UI spec and problems with adjusting to the older API are described in the document http://core.netbeans.org/windowsystem/changes.html. It shows also recommends how the client code should be adjusted to the new window system. If you think this issue apply also to the new winsys then change the subcomponent (to "core/window system") and REOPEN it.
issue doesn't apply to new window system - verified