Some fonts rendered incorrectly since upgrade to Qt 5.9.1

["Miguel A. Vallejo" <ea4eoz@gmail.com>]

Hello.

Since the last upgrade in Sid to Qt 5.9.1 I have noticed some fonts
rendered incorrectly in Qt applications, like Dolphin, VLC and some
other ones.

The rendered font seems to be some bolded text, but it is rendered
broken, see attached image.

Any ideas?

Thanks in advance.

Attachment: Screenshot_20170827_141735.png
Description: PNG image