Re: [patch] cache color info for remote X sessions [Was: Emacs 21/X11 generating unbelieveable network traffic]

[Richard Stallman]

    "should" -> yes.  "Can" is trickier.  In order for an old cache entry to be
    "wrong", the X server will have to allocate a colormap entry once, then
    dealloc it, then allocate another color in that space.

Do most PCs nowadays have color maps, or do they store the actual
color values in the pixel?  In another context recently someone said
it was the latter.  If the latter, we could turn off the caching code
on the occasional displays that really have a color map.