Converts coordinate (buffer_x, buffer_y) to coordinates for the window win, and stores the result
in (window_x, window_y).
Note that you can’t convert coordinates for a nonexisting window (see set_border_window_size).
| this |
a TextView |
| win |
a TextWindowType, except gtk_text_window_private |
| buffer_x |
buffer x coordinate |
| buffer_y |
buffer y coordinate |
| window_x |
window x coordinate return location or null |
| window_y |
window y coordinate return location or null |