_gtkTableAddEx adds a Widget object in a Tables
object. A child can be expanded on several "cell".
Prototype : fun [ObjGtkTable * I I I I [I I] [I I]] ObjGtkTable
ObjGtkTable : a Tables object (the parent).
* : a Widget object (the child).
I : the column number to attach the left side of the child widget.
I : the column number to attach the right side of the child widget.
I : the row number to attach the top side of the child widget.
I : the row number to attach the bottom side of the child widget.
[I I] : a tuple : specify the horizontal and the vertical behaviour
of the child when it or its parent resizes :
EXPAND : expand to take up any extra space in its container that has been allocated,
SHRINK : shrink as and when possible,
FILL : fill the space allocated to it.
Can be nil, in this case the default option is EXPAND|FILL
[I I] : a tuple : Specify th extra space between the child
and its left and right neighbors, between the child and its top and
bottom neighbors respectivrly. In pixels (0 <= value < 65535 else
the value will be clamped). Can be nil (0, 0 in this case).
Return ObjGtkTable : the same Tables or nil if an error occurs.
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