"KDE's window-specific settings feature gives you a fine level
of control over the way windows behave. It lets you change settings
such as minimum/maximum size, position, overlay, and transparency.
The GIMP uses multiple windows to select tools, tool options, and
other items used in the process of image editing. By changing the
default behavior of the various windows used by GIMP with KDE's
window-specific settings, you can improve the GIMP interface.
"Before getting into window-specific settings, you can use the
GIMP's own window features to preserve your favorite layout..."