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gtk_text_iter_backward_line() checks the value of real->line_char_offset without previously calling ensure_char_offsets (real) to make sure the former is up-to-date. As a consequence of this, when gtk_text_iter_backward_line() is called after a gtk_text_buffer_insert_range() in the first line of buffer, the iter is not moved to the start of the line, and the return value is wrong. Fixed by adding the ensure_char_offsets() call. A test case for this bug is added to the textiter gtk testsuite.
c4874aea