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Product Version = NetBeans IDE 8.1 Beta (Build 201508041349) Operating System = Windows 7 version 6.1 running on amd64 Java; VM; Vendor = 1.8.0_51 Runtime = Java HotSpot(TM) 64-Bit Server VM 25.51-b03 I propose to add an option in Tools -> Options -> Appearance -> Document Tab Beside Top, Left, Bottom and Right a new option "Left tree" (maybe same for right) should be availabe If the user chooses this option, then open documents wouldn't be displayed as a series of buttons ("tabs"), but as a tree. This tree exactly looks like a "reduced project tree", but is resticted to those files which are currently opened within the editor(s). Thus all leaves are files, all other nodes are packages. The user may expand or collapse like in the project tree. An [x] is offered on any level to close the editor(s) for a single file or all open files contained in this package. This proposal might replace or complement proposal #254544
Created attachment 155523 [details] IDE log
Reassigning for further evaluation.