Adds the mark at position @where. The mark must not be added to
another buffer, and if its name is not %NULL then there must not
be another mark in the buffer with the same name.
Emits the #GtkTextBuffer::mark-set signal as notification of the mark's
initial placement.
Adds the mark at position @where. The mark must not be added to another buffer, and if its name is not %NULL then there must not be another mark in the buffer with the same name.
Emits the #GtkTextBuffer::mark-set signal as notification of the mark's initial placement.