The heuristic of finding the visual baseline is based on analyzing the rendered pixmap. This is not pretty, but we really need to have a test for baselines in order to not cause future regressions whenever things are changed in the styles. This is the reason why we choose to use a string of 'L's, since the letter has a distinctive baseline. If it turns out that the heuristic gives too many false positives, this approach should be reconsidered. Change-Id: Ic8de576244fa032617ff7546ddbe20dc6910c7bf Reviewed-by: Caroline Chao <caroline.chao@theqtcompany.com>