number of columns in the layout grid.
column of the specific #WnckWorkspace, starting from 0.
row of the specific #WnckWorkspace, starting from 0.
array of size grid_area containing the index (starting from 0) of
the #WnckWorkspace for each position in the layout grid, or -1 if the
position does not correspond to any #WnckWorkspace.
size of the grid containing all #WnckWorkspace. This can be bigger than the number of #WnckWorkspace because the grid might not be filled.
number of rows in the layout grid.
The #WnckWorkspaceLayout struct contains information about the layout of #WnckWorkspace on a #WnckScreen, and the exact position of a specific #WnckWorkspace.