Please describe the problem:
I realized that lately there have been some output to stdout when
selecting an item on the color selection's palette.

Looks like the culprit is palette_paint at gtkcolorsel.c:607
// ....
625   set_focus_line_attributes (drawing_area, cr, &focus_width);
626   g_print ("%g %g %g %g\n",
627            focus_width / 2., focus_width / 2.,
628            (double)drawing_area->allocation.width - focus_width,
629            (double)drawing_area->allocation.height - focus_width);
// ...


Steps to reproduce:
1. Open a gtk colo chooser dialog with palette
2. Click on a palette item


Actual results:
It prints some output to stdout.

Expected results:
It doesn't prints anything to stdout

Does this happen every time?
Yes

Other information: