Window component order

[John Yates <john@yates-sheets.org>]

I am embarking on allowing the mode-line to appear
at the top of a window.  To do so, one function I need
to visit is window.c's coordinates_in_window.  This is
a rather tortured bit of logic so before I go too far I
would like to validate my current understanding of
window layout.

Including a possible mode-line at top, is this the
proper top to bottom ordering of components?
(I understand, that config setting will influence
which components are actually present.)

    Top mode line
    Tab line
    Header line
    Text area
    Bottom mode line
    Horizontal scroll bar
    Bottom window divider

Similarly, is this the proper left to right ordering
of components?

    Grabbable left vertical border
    Vertical scroll bar on left
    Left fringe
    Left margin
    Text area
    Right margin
    Right fringe
    Vertical scroll bar on right
    Right window divider
    Grabbable right vertical border

/john