Sure, it’s Chromium 59, Ubuntu 17.04. I just checked and the same problem appears in Firefox, too. I have also tried a couple of different fonts, same deal. Here’s a screenshot using Source Sans Pro, with Loma (system default) for Thai.
I was originally referring to the top bar when contracted. But the same issue is showing up in the regular view, which is what you see above. Here’s the same problem in the title bar when contracted:
It is tricky to get this stuff right, but a line-height of 1.1 is asking for trouble.