setFixedWidth

If @fixed_width is not -1, sets the fixed width of @tree_column; otherwise unsets it. The effective value of @fixed_width is clamped between the minimum and maximum width of the column; however, the value stored in the “fixed-width” property is not clamped. If the column sizing is %GTK_TREE_VIEW_COLUMN_GROW_ONLY or %GTK_TREE_VIEW_COLUMN_AUTOSIZE, setting a fixed width overrides the automatically calculated width. Note that

Parameters