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When deleting a GUI component from Navigator, the component tree disappears (the java navigator appears instead). 1) Create a GUI form, add a few components from palette. 2) Select a component in Navigator, delete. -> The panel with GUI inspector component tree disappears. The java navigator, that should be only in source, code appears instead. The Properties window is blank, no window has focus. It does not happen always, but quite often. It's pretty annoying to lose the navigator tree when working with it. I suspect this was caused by http://hg.netbeans.org/core-main/rev/80ad9715bf8a Setting this as P2, rather bad regression that should not make it to final release.
fix: http://hg.netbeans.org/core-main/rev/55c26b6212d2