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The panel the views combo is in on OS-X should either be set to be not opaque or acquire the same background as the list (possibly with line MatteBorder on the bottom) on OS-X.
On thinking about it more, the background color is fine - it looks fine when it's docked, just not when it's floating. Only thing missing is the bottom border for the panel, which should be similar to the filters panel.
Created attachment 21159 [details] Screen shot
On second thought, no, probably when floating on OS-X its background should be white - the problem is the artificial additional width the floating window border on Mac OS creates - no real way to make this look nice.
OK, but downgrading a bit.
Milos please help me with this please, code is in core/navigator somewhere, I don't remember...
BTW, the way I ended up having to deal with this in the property sheet was a JComboBox subclass that returned 0,0,0,0 for its insets - you may find the gray is painted by the combo box border that does all the pretty aqua decoration. Not nice, but it worked.
core/navigator issue
Surprisingly, after several years, java navigation new implementation and saubrecht's work on Mac LF, the bug is gone! :-)