Appends column to the list of columns.
Use [class@Gtk.ListView] or [class@Gtk.ColumnView] instead
If this has “fixed_height” mode enabled, then column must have its “sizing”
property set to be GTK_TREE_VIEW_COLUMN_FIXED.
| this |
A `GtkTreeView`. |
| column |
The `GtkTreeViewColumn` to add. |
|
The number of columns in this after appending. |