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There is option for coloring of editor tabs: in Options \ Appearance \ Document Tabs \ Same background color for files from the same project. If you have opened more than 9 projects, only first 9 of them (in order of opening) will have custom color. The rest will have default gray tabs. The possible cause is in class org.netbeans.core.multitabs.impl.ProjectColorTabDecorator. Here is defined 9 colors in the array backGroundColors. The possible solution is to add more predefined colors or to implement some clever algorithm to generate a set of distinguishable pale colors on demand. Product Version: NetBeans IDE 8.0.2 (Build 201411181905) Java: 1.8.0_25; Java HotSpot(TM) 64-Bit Server VM 25.25-b02 Runtime: Java(TM) SE Runtime Environment 1.8.0_25-b17 System: Linux version 3.17.7-200.fc20.x86_64 running on amd64; UTF-8; en_US (nb)
Another possible solution is to assign a color to a project only if user open a file from a project. And to "recall" a color of a project when there is no opened editor windows for this project. Because we have often a bunch of opened projects in the same time, but almost never have opened editor windows for more than 9 of projects.
*** Bug 252390 has been marked as a duplicate of this bug. ***
*** Bug 268532 has been marked as a duplicate of this bug. ***