- Method add_child_in_window
Adds a child at fixed coordinates in one of the text widget's windows. The window must have nonzero size (see GTK2.TextView->set_border_window_size()). Note that the child coordinates are given relative to the GDK2.Window in question, and that these coordinates have no sane relationship to scrolling. When placing a child in GTK2.TEXT_WINDOW_WIDGET, scrolling is irrelevant, the child floats above all scrollable areas. But when placing a child in one of the scrollable windows (border windows or text window), you'll need to compute the child's correct position in buffer coordinates any time scrolling occurs or buffer changes occur, and then call GTK2.TextView->move_child() to update the child's position. Unfortunately there's no good way to detect that scrolling has occurred, using the current API; a possible hack would be to update all child positions when the scroll adjustments change or the text buffer changes.