Enables or disables the fixed height mode of tree_view.
Fixed height mode speeds up GtkTreeView by assuming that all
rows have the same height.
Only enable this option if all rows are the same height and all
columns are of type GTK_TREE_VIEW_COLUMN_FIXED.
Since 2.6
Enables or disables the fixed height mode of tree_view. Fixed height mode speeds up GtkTreeView by assuming that all rows have the same height. Only enable this option if all rows are the same height and all columns are of type GTK_TREE_VIEW_COLUMN_FIXED. Since 2.6