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I am not sure what this window is, but I generally have no interest in touching CSS, yet the window seems to be constantly being opened in recent dev builds for no clear reason.
fixed in web-main#917c140c6b52
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/917c140c6b52 User: Marek Fukala <mfukala@netbeans.org> Log: #205005 - Stop opening "StyleBuilder"
verified. StyleBuilder is opened when css file is opened in editor and after closing editor tab with the css file (or switching do different tab) it's closed. Product Version: NetBeans IDE 7.1 RC2 (Build 201111302200) Java: 1.7.0_02; Java HotSpot(TM) Client VM 22.0-b10 System: Linux version 3.0.0-13-generic-pae running on i386; UTF-8; en_US (nb)