If resizable is true, then the user can explicitly resize the column by grabbing the outer edge of the column button.
If resizable is true and sizing mode of the column is gtk.types.TreeViewColumnSizing.Autosize, then the sizing mode is changed to gtk.types.TreeViewColumnSizing.GrowOnly.
true, if the column can be resized
Deprecated: Use GtkColumnView instead
If resizable is true, then the user can explicitly resize the column by grabbing the outer edge of the column button.
If resizable is true and sizing mode of the column is gtk.types.TreeViewColumnSizing.Autosize, then the sizing mode is changed to gtk.types.TreeViewColumnSizing.GrowOnly.