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The new propertysheet implementation will dynamically add components to itself (cell editors). Whenever a component is added or removed, the entire output window turns gray for about a quarter of a second, then repaints itself. My guess is that something in the hierarchy added an AncestorListener and is responsible for this behavior. It should be fixed for 4.0, it looks very bad.
Sounds like winsys issue? Tim, in the bug description you wanted to say "Options Dialog" and not "Output Window", right?
Yes, options dialog - I shouldn't file bugs at 3 in the morning. I have a feeling it's not a winsys issue, since the problem only occurs in the options dialog, not in other similar windows. Something is reacting in a big way whenever a component is added or removed to a child of the window.
Then maybe explorer?
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