c_gtk_grid_attach_next_to

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.

__gshared extern (C)

void function(GtkGrid* grid, GtkWidget* child, GtkWidget* sibling, GtkPositionType side, int width, int height) c_gtk_grid_attach_next_to;

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