Inserts @new_text_length bytes of @new_text into the contents of the widget, at position @position.
Note that the position is in characters, not in bytes. The function updates @position to point after the newly inserted text.
the text to append
the length of the text in bytes, or -1
location of the position text will be inserted at
See Implementation
Inserts @new_text_length bytes of @new_text into the contents of the widget, at position @position.
Note that the position is in characters, not in bytes. The function updates @position to point after the newly inserted text.