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Some issues concerning the GTK LaF support. I have attached a picture of NB running under the GTK LaF and some theme. I have highlighted the problem zones. 1. The first one is about the ugly icons used in the tab selector of the editor. 2. The second concerns the x and arrow used in the non editor tabs. They are always black, they should change color with the theme. Also the shading (shadow) of the tab upper part does not always fit. The best would be if they would adapt to the current form of the tab, but it may be easier to remove the shading completely (although it's cool). 3. The third one is the color and the font style of the editor gutter. They don't adapt to the theme or desktop settings (and to all unsupported LaFs?) 4. The font used in the editor status bar. It doesn't fits to the desktop settings either.
Created attachment 37068 [details] NB running under GTK (linux) (with Murrine engine)
There still are issues with the GTK+ L&F, which is outdated and doesn't even match the latest generation of GTK themes (Adwaita) at all. IMHO, it would be much better to switch to Nimbus by default on Linux/Unix platforms!
Here's an article detailing a workaround for some GTK L&F issues: http://www.ailis.de/~k/archives/67-Workaround-for-borderless-Java-Swing-menus-on-Linux.html