Gtk.TextBuffer.prototype.get_text

function get_text(start:Gtk.TextIter, end:Gtk.TextIter, include_hidden_chars:Boolean):String {
    // Gjs wrapper for gtk_text_buffer_get_text()
}

Returns the text in the range [start,end). Excludes undisplayed text (text marked with tags that set the invisibility attribute) if include_hidden_chars is false. Does not include characters representing embedded images, so byte and character indexes into the returned string do <emphasis>not</emphasis> correspond to byte and character indexes into the buffer. Contrast with Gtk.TextBuffer.prototype.get_slice.