//The caret width is 2;
//Maybe sometimes we will make a mistake, but for most of the time, it should be the caret.
if (rectangle->width == 2 && GTK_IS_IM_CONTEXT(local_context)) {
gtk_im_context_set_cursor_location(local_context, rectangle);
}
}
//this is needed, for example, if you input something in file dialog and return back the edit area
//context will lost, so here we set it again.