gtkTreeViewColumnCellIsVisible
Returns TRUE if any of the cells packed into the tree.column are visible.
For this to be meaningful, you must first initialize the cells with
gtkTreeViewColumnCellSetCellData
gtkTreeViewColumnCellIsVisible(object)
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[logical] TRUE, if any of the cells packed into the tree.column are currently visible
Derived by RGtkGen from GTK+ documentation
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