Ondro, gutter colors are taken from Tools-Options -> Fonts & Colors -> Highlighting -> 'Line Number'. So, you are right
that they don't reflect L&F, but they are customizable by a user the same way as other editor colors. Maybe, we should
enhance our color pickers to allow choosing something like 'L&F default'. What exactly is the problem here?

Thanks for explanation, Vita. The problem is that current gutter background color (set by
http://ui.netbeans.org/docs/ui/editor/gutter/glyphgutter-foldingbar.html) has been chosen for winXP look and feel, but
does look pretty bad on nimbus L&F. 

The solution would be to find a color suitable for all L&F (may not even be possible) or use L&F specific color. The
solution with L&F specific in the chooser is fine with me (should be default setting). I will talk with VDs and provide
color code for nimbus theme. 

Actually, it seems that the current color is not ideal even for winXP look & feel. The only L&F it goes well with is the
MacOSX, where the color is virtually identical to that of standard color of swing panels. 

Is anyone aware of a historic reason why the gutter has different color from standard system specified color of other
components?

> Is anyone aware of a historic reason why the gutter has different color from standard system specified color
> of other components?

Probably not, and I don't think they matter that much. We just have to decide on how to fix it. Ideally, I would prefer
using a color derived from swing (ie. no Netbeans hardcoded colors for different L&Fs).

Vita, I agree that what you suggest is the best solution. Let's use standard swing color, but make it customizable (for
use with themes with black or dark background). 

Removing the UNCOMPLETE keyword as I believe all information necessary for implementation should be present. If there is
anything needed from HIE, let me know. 

After having discussed this with anebuzelsky and dsimonek, I'm summarizing that:
--------------------------------------------------------------------------------

1) the desired default color should be the one used e.g. for background of status line

2) It should remain customizable in Tools-Options -> Fonts & Colors -> Highlighting -> 'Line Number'. This can be done
by either introducing a new value in the combo ("Default" or "Look and Feel default") or by changing the parent element
for the "Inherited" value to something which has the proper color. (I personally think the later approach is the better,
unless there is a particular reason for this inheritance I'm not aware of. What element does the gutter inherit from
right now?)

Bug prior to 7.0, not touched for the last 2 years --> P4.

The current customizability as "Line Number" seems straightforward enough for me so I would leave it as it is unless we have a clear solution that would be more intuitive than the current state.

Btw editor (if not undocked) now uses global status line (asked in comment 7).