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I noticed this with the new property sheet code: Multi-select a bunch of files and choose Open from the context menu. The window manager will fire changes in the selected node <number of files> times. This surely is a performance problem, as the property sheet will repaint for each file opened, and anything else listening for the currently selected node will do its processing. Not sure if this is really a window system or editor issue, but I'd consider it a requirement for the rewrite that this behavior not happen - opening a bunch of files should be atomic. So I'm creating this issue so it can be tracked for the window system rewrite.
Yes we plan changes in API to allow handling multiple components simultaneously.
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