Considering the default editability of the buffer, and tags that
affect editability, determines whether text inserted at @iter would
be editable. If text inserted at @iter would be editable then the
user should be allowed to insert text at @iter.
gtk_text_buffer_insert_interactive() uses this function to decide
whether insertions are allowed at a given position.
Considering the default editability of the buffer, and tags that affect editability, determines whether text inserted at @iter would be editable. If text inserted at @iter would be editable then the user should be allowed to insert text at @iter. gtk_text_buffer_insert_interactive() uses this function to decide whether insertions are allowed at a given position.